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Li F, Lan J, Li X, Chung LW. A Synergistic Bimetallic Ti/Co-Catalyzed Isomerization of Epoxides to Allylic Alcohols Enabled by Two-State Reactivity. Inorg Chem 2024; 63:6285-6295. [PMID: 38517250 DOI: 10.1021/acs.inorgchem.4c00011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2024]
Abstract
Isomerization of epoxides into versatile allylic alcohols is an atom-economical synthetic method to afford vicinal bifunctional groups. Comprehensive density functional theory (DFT) calculations were carried out to elucidate the complex mechanism of a bimetallic Ti/Co-catalyzed selective isomerization of epoxides to allyl alcohols by examining several possible pathways. Our results suggest a possible mechanism involving (1) radical-type epoxide ring opening catalyzed by Cp2Ti(III)Cl leading to a Ti(IV)-bound β-alkyl radical, (2) hydrogen-atom transfer (HAT) catalyzed by the Co(II) catalyst to form the Ti(IV)-enolate and Co(III)-H intermediate, (3) protonation to give the alcohols, and (4) proton abstraction to form the Co(I) species followed by electron transfer to regenerate the active Co(II) and Ti(III) species. Moreover, bimetallic catalysis and two-state reactivity enable the key rate-determining HAT step. Furthermore, a subtle balance between dispersion-driven bimetallic processes and entropy-driven monometallic processes determines the most favorable pathway, among which the monometallic process is energetically more favorable in all steps except the vital hydrogen-atom transfer step. Our study should provide an in-depth mechanistic understanding of bimetallic catalysis.
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Affiliation(s)
- Fangfang Li
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jialing Lan
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Xin Li
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
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2
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Liang R, Zhou Q, Li X, Wong MW, Chung LW. A Computational Study on the Reaction Mechanism of Stereocontrolled Synthesis of β-Lactam within [2]Rotaxane. J Org Chem 2023. [PMID: 37257155 DOI: 10.1021/acs.joc.3c00330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The macrocycle effect of [2]rotaxane on the highly trans-stereoselective cyclization reaction of N-benzylfumaramide was extensively investigated by various computational methods, including DFT and high-level DLPNO-CCSD(T) methods. Our computational results suggest that the most favorable mechanism of the CsOH-promoted cyclization of the fumaramide into trans-β-lactam within [2]rotaxane initiates with deprotonation of a N-benzyl group of the interlocked fumaramide substrate by CsOH, followed by the trans-selective C-C bond formation and protonation by one amide functional group of the macrocycle. Our distortion/interaction analysis further shows that the uncommon trans-stereoselective cyclization forming β-lactam within the rotaxane may be attributed to a higher distortion energy (mainly from the distortion of the twisted cis-fumaramide conformation enforced by the rotaxane). Our systematic study should give deeper mechanistic insight into the reaction mechanism influenced by a supramolecular host.
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Affiliation(s)
- Rong Liang
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
| | - Qinghai Zhou
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
- The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Frontiers Science Center of Biomimetic Catalysis, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
| | - Xin Li
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Ming Wah Wong
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
| | - Lung Wa Chung
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
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3
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Chang X, Liu XT, Li F, Yang Y, Chung LW, Wang CJ. Electron-rich benzofulvenes as effective dipolarophiles in copper(i)-catalyzed asymmetric 1,3-dipolar cycloaddition of azomethine ylides. Chem Sci 2023; 14:5460-5469. [PMID: 37234882 PMCID: PMC10207880 DOI: 10.1039/d3sc00435j] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 04/25/2023] [Indexed: 05/28/2023] Open
Abstract
A series of benzofulvenes without any electron-withdrawing substituents were employed as 2π-type dipolarophiles for the first time to participate in Cu(i)-catalyzed asymmetric 1,3-dipolar cycloaddition (1,3-DC) reactions of azomethine ylides. An intrinsic non-benzenoid aromatic characteristic from benzofulvenes serves as a key driving force for activation of the electron-rich benzofulvenes. Utilizing the current methodology, a wide range of multi-substituted chiral spiro-pyrrolidine derivatives containing two contiguous all-carbon quaternary centers were formed in good yield with exclusive chemo-/regioselectivity and high to excellent stereoselectivity. Computational mechanistic studies elucidate the origin of the stereochemical outcome and the chemoselectivity, in which the thermostability of these cycloaddition products is the major factor.
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Affiliation(s)
- Xin Chang
- Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University Wuhan 430072 China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry Shanghai 230021 China
| | - Xue-Tao Liu
- Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University Wuhan 430072 China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry Shanghai 230021 China
| | - Fangfang Li
- Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology Shenzhen 518055 China
| | - Yuhong Yang
- Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology Shenzhen 518055 China
| | - Lung Wa Chung
- Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology Shenzhen 518055 China
| | - Chun-Jiang Wang
- Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University Wuhan 430072 China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry Shanghai 230021 China
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4
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Zhou M, Lin Y, Chen XX, Xu G, Chung LW, Tang W. Asymmetric Synthesis of Vicinal Tetrasubstituted Diamines via Reductive Coupling of Ketimines Templated by Chiral Diborons. Angew Chem Int Ed Engl 2023; 62:e202300334. [PMID: 36859620 DOI: 10.1002/anie.202300334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 02/23/2023] [Accepted: 03/01/2023] [Indexed: 03/03/2023]
Abstract
We herein describe the chiral diboron-templated asymmetric homocoupling of aryl alkyl ketimines, providing for the first time a series of chiral vicinal tetrasubstituted diamines with excellent ee values and good to high yields. The powerful and efficient diboron-participated [3,3]-sigmatropic rearrangement is successfully demonstrated by the homocoupling of a variety of ketimines thanks to the rational design and engineering of chiral diborons. Systematic DFT studies suggest that two chiral diborons adopt different conformational assembling strategies to couple the diboron template with ketimine substrates in their tight concerted transition states to ensure the excellent enantioselectivities. The synthetic value of chiral vicinal tetrasubstituted diamines is demonstrated by the asymmetric α-bromination of aliphatic aldehydes by employing a chiral vicinal tetrasubstituted diamine-based organocatalyst.
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Affiliation(s)
- Mingkang Zhou
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, 345 Ling Ling Road, Shanghai, 200032, China
| | - Yaodong Lin
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, 345 Ling Ling Road, Shanghai, 200032, China
| | - Xiao-Xuan Chen
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Guangqing Xu
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, 345 Ling Ling Road, Shanghai, 200032, China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Wenjun Tang
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, 345 Ling Ling Road, Shanghai, 200032, China.,School of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou, 310024, China
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5
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Zhou M, Lin Y, Chen XX, Xu G, Chung LW, Tang W. Asymmetric Synthesis of Vicinal Tetrasubstituted Diamines via Reductive Coupling of Ketimines Templated by Chiral Diborons. Angew Chem Int Ed Engl 2023. [DOI: 10.1002/ange.202300334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
Affiliation(s)
- Mingkang Zhou
- Shanghai Institute of Organic Chemistry State Key Laboratory of Bio-Organic and Natural Products Chemistry CHINA
| | - Yaodong Lin
- Shanghai Institute of Organic Chemistry State Key Laboratory of Bio-Organic and Natural Products Chemistry CHINA
| | | | - Guangqing Xu
- Shanghai Institute of Organic Chemistry State Key Laboratory of Bio-Organic and Natural Products Chemistry CHINA
| | - Lung Wa Chung
- Shenzhen Grubbs Institute Department of Chemistry CHINA
| | - Wenjun Tang
- Shanghai Institute of Organic Chemistry State Key Laboratory of Bio-Organic and Natural Products Chemistry 345 Ling Ling Road 200032 Shanghai CHINA
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6
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Ma Z, Yan Z, Li X, Chung LW. Quantum Tunneling in Reactions Modulated by External Electric Fields: Reactivity and Selectivity. J Phys Chem Lett 2023; 14:1124-1132. [PMID: 36705472 DOI: 10.1021/acs.jpclett.2c03461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Quantum tunneling and external electric fields (EEFs) can promote some reactions. However, the synergetic effect of an EEF on a tunneling-involving reaction and its temperature-dependence is not very clear. In this study, we extensively investigated how EEFs affect three reactions that involve hydrogen- or (ground- and excited-state) carbon-tunneling using reliable DFT, DLPNO-CCSD(T1), and variational transition-state theory methods. Our study revealed that oriented EEFs can significantly reduce the barrier and corresponding barrier width (and vice versa) through more electrostatic stabilization in transition states. These EEF effects enhance the nontunneling and tunneling-involving rates. Such EEF effects also decrease the crossover temperatures and quantum tunneling contribution, albeit with lower and thinner barriers. Moreover, EEFs can modulate and switch on/off the tunneling-driven 1,2-H migration of hydroxycarbenes under cryogenic conditions. Furthermore, our study predicts for the first time that EEF/tunneling synergy can control the chemo- or site-selectivity of one molecule bearing two similar/same reactive sites.
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Affiliation(s)
- Zhifeng Ma
- Shenzhen Grubbs Institute, Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, 1088 Xueyuan Avenue, Shenzhen 518055, P. R. China
| | - Zeyin Yan
- Shenzhen Grubbs Institute, Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, 1088 Xueyuan Avenue, Shenzhen 518055, P. R. China
| | - Xin Li
- Shenzhen Grubbs Institute, Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, 1088 Xueyuan Avenue, Shenzhen 518055, P. R. China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute, Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, 1088 Xueyuan Avenue, Shenzhen 518055, P. R. China
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7
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Qin C, Huang Z, Wu SB, Li Z, Yang Y, Xu S, Zhang X, Liu G, Wu YD, Chung LW, Huang Z. Breaking Conventional Site Selectivity in C–H Bond Activation: Selective sp 3 versus sp 2 Silylation by a Pincer-Based Pocket. J Am Chem Soc 2022; 144:20903-20914. [DOI: 10.1021/jacs.2c09356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Chuan Qin
- The State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Zhidao Huang
- The State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Song-Bai Wu
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
- Lab of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Zhuangxing Li
- The State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Yuhong Yang
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Songgen Xu
- The State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Xin Zhang
- The State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Guixia Liu
- The State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Yun-Dong Wu
- Lab of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Zheng Huang
- The State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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8
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Lan J, Zhang T, Yang Y, Li X, Chung LW. A Mechanistic Study of the Cobalt(I)-Catalyzed Amination of Aryl Halides: Effects of Metal and Ligand. Inorg Chem 2022; 61:18019-18032. [DOI: 10.1021/acs.inorgchem.2c02385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jialing Lan
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Tonghuan Zhang
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
- Lab of Computational Chemistry and Drug Design, Key Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen, 518055, China
| | - Yuhong Yang
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Xin Li
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
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9
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Wang T, Chen X, Zhu D, Chung LW, Xu M. Frontispiz: Rhodium(I) Carbene‐Promoted Enantioselective C−H Functionalization of Simple Unprotected Indoles, Pyrroles and Heteroanalogues: New Mechanistic Insights. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202283462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Tian‐Yi Wang
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences and School of Pharmacy University of Chinese Academy of Sciences Shanghai 201203 China
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen 518055 China
| | - Xiao‐Xuan Chen
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen 518055 China
| | - Dong‐Xing Zhu
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences and School of Pharmacy University of Chinese Academy of Sciences Shanghai 201203 China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen 518055 China
| | - Ming‐Hua Xu
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences and School of Pharmacy University of Chinese Academy of Sciences Shanghai 201203 China
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen 518055 China
- School of Chemistry and Chemical Engineering Henan Normal University Xinxiang Henan 453007 China
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10
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Wang T, Chen X, Zhu D, Chung LW, Xu M. Rhodium(I) Carbene‐Promoted Enantioselective C−H Functionalization of Simple Unprotected Indoles, Pyrroles and Heteroanalogues: New Mechanistic Insights. Angew Chem Int Ed Engl 2022; 61:e202207008. [DOI: 10.1002/anie.202207008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Indexed: 11/07/2022]
Affiliation(s)
- Tian‐Yi Wang
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences and School of Pharmacy University of Chinese Academy of Sciences Shanghai 201203 China
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen 518055 China
| | - Xiao‐Xuan Chen
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen 518055 China
| | - Dong‐Xing Zhu
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences and School of Pharmacy University of Chinese Academy of Sciences Shanghai 201203 China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen 518055 China
| | - Ming‐Hua Xu
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences and School of Pharmacy University of Chinese Academy of Sciences Shanghai 201203 China
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen 518055 China
- School of Chemistry and Chemical Engineering Henan Normal University Xinxiang Henan 453007 China
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11
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Wang T, Chen X, Zhu D, Chung LW, Xu M. Frontispiece: Rhodium(I) Carbene‐Promoted Enantioselective C−H Functionalization of Simple Unprotected Indoles, Pyrroles and Heteroanalogues: New Mechanistic Insights. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/anie.202283462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tian‐Yi Wang
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences and School of Pharmacy University of Chinese Academy of Sciences Shanghai 201203 China
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen 518055 China
| | - Xiao‐Xuan Chen
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen 518055 China
| | - Dong‐Xing Zhu
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences and School of Pharmacy University of Chinese Academy of Sciences Shanghai 201203 China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen 518055 China
| | - Ming‐Hua Xu
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences and School of Pharmacy University of Chinese Academy of Sciences Shanghai 201203 China
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen 518055 China
- School of Chemistry and Chemical Engineering Henan Normal University Xinxiang Henan 453007 China
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12
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Xu MH, Wang TY, Chen XX, Zhu DX, Chung LW. Rhodium(I) Carbene‐Promoted Enantioselective C‐H Functionalization of Simple Unprotected Indoles, Pyrroles and Heteroanalogues: New Mechanistic Insights. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202207008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ming-Hua Xu
- Southern University of Science and Technology Department of Chemistry No. 1088, Xueyuan Road 518055 Shenzhen CHINA
| | - Tian-Yi Wang
- Shanghai Institute of Materia Medica CAS: Shanghai Institute of Materia Medica Chinese Academy of Sciences State Key Laboratory of Drug Research CHINA
| | - Xiao-Xuan Chen
- Southern University of Science and Technology Chemistry CHINA
| | - Dong-Xing Zhu
- Shanghai Institute of Materia Medica Chinese Academy of Sciences State Key Laboratory of Drug Research CHINA
| | - Lung Wa Chung
- Southern University of Science and Technology Chemistry CHINA
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13
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Lan J, Li X, Yang Y, Zhang X, Chung LW. New Insights and Predictions into Complex Homogeneous Reactions Enabled by Computational Chemistry in Synergy with Experiments: Isotopes and Mechanisms. Acc Chem Res 2022; 55:1109-1123. [PMID: 35385649 DOI: 10.1021/acs.accounts.1c00774] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Homogeneous catalysis and biocatalysis have been widely applied in synthetic, medicinal, and energy chemistry as well as synthetic biology. Driven by developments of new computational chemistry methods and better computer hardware, computational chemistry has become an essentially indispensable mechanistic "instrument" to help understand structures and decipher reaction mechanisms in catalysis. In addition, synergy between computational and experimental chemistry deepens our mechanistic understanding, which further promotes the rational design of new catalysts. In this Account, we summarize new or deeper mechanistic insights (including isotope, dispersion, and dynamical effects) into several complex homogeneous reactions from our systematic computational studies along with subsequent experimental studies by different groups. Apart from uncovering new mechanisms in some reactions, a few computational predictions (such as excited-state heavy-atom tunneling, steric-controlled enantioswitching, and a new geminal addition mechanism) based on our mechanistic insights were further verified by ensuing experiments.The Zimmerman group developed a photoinduced triplet di-π-methane rearrangement to form cyclopropane derivatives. Recently, our computational study predicted the first excited-state heavy-atom (carbon) quantum tunneling in one triplet di-π-methane rearrangement, in which the reaction rates and 12C/13C kinetic isotope effects (KIEs) can be enhanced by quantum tunneling at low temperatures. This unprecedented excited-state heavy-atom tunneling in a photoinduced reaction has recently been verified by an experimental 12C/13C KIE study by the Singleton group. Such combined computational and experimental studies should open up opportunities to discover more rare excited-state heavy-atom tunneling in other photoinduced reactions. In addition, we found unexpectedly large secondary KIE values in the five-coordinate Fe(III)-catalyzed hetero-Diels-Alder pathway, even with substantial C-C bond formation, due to the non-negligible equilibrium isotope effect (EIE) derived from altered metal coordination. Therefore, these KIE values cannot reliably reflect transition-state structures for the five-coordinate metal pathway. Furthermore, our density functional theory (DFT) quasi-classical molecular dynamics (MD) simulations demonstrated that the coordination mode and/or spin state of the iron metal as well as an electric field can affect the dynamics of this reaction (e.g., the dynamically stepwise process, the entrance/exit reaction channels).Moreover, we unveiled a new reaction mechanism to account for the uncommon Ru(II)-catalyzed geminal-addition semihydrogenation and hydroboration of silyl alkynes. Our proposed key gem-Ru(II)-carbene intermediates derived from double migrations on the same alkyne carbon were verified by crossover experiments. Additionally, our DFT MD simulations suggested that the first hydrogen migration transition-state structures may directly and quickly form the key gem-Ru-carbene structures, thereby "bypassing" the second migration step. Furthermore, our extensive study revealed the origin of the enantioselectivity of the Cu(I)-catalyzed 1,3-dipolar cycloaddition of azomethine ylides with β-substituted alkenyl bicyclic heteroarenes enabled by dual coordination of both substrates. Such mechanistic insights promoted our computational predictions of the enantioselectivity reversal for the corresponding monocyclic heteroarene substrates and the regiospecific addition to the less reactive internal C═C bond of one diene substrate. These predictions were proven by our experimental collaborators. Finally, our mechanistic insights into a few other reactions are also presented. Overall, we hope that these interactive computational and experimental studies enrich our mechanistic understanding and aid in reaction development.
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Affiliation(s)
- Jialing Lan
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
- Shenzhen Grubbs Institute, Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Xin Li
- Shenzhen Grubbs Institute, Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Yuhong Yang
- Shenzhen Grubbs Institute, Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Xiaoyong Zhang
- Shenzhen Grubbs Institute, Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute, Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
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14
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Liu G, Zheng L, Tian K, Wang H, Chung LW, Zhang X, Dong XQ. Ir-Catalyzed Asymmetric Hydrogenation of Unprotected Indoles: Scope Investigations and Mechanistic Studies. CCS Chem 2022. [DOI: 10.31635/ccschem.022.202101643] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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15
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Wang Q, Lan J, Liang R, Xia Y, Qin L, Chung LW, Zheng Z. New Tricks for an Old Dog: Grubbs Catalysts Enable Efficient Hydrogen Production from Aqueous-Phase Methanol Reforming. ACS Catal 2022. [DOI: 10.1021/acscatal.1c05369] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Qian Wang
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Jialing Lan
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Rong Liang
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Yihao Xia
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Lei Qin
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Lung Wa Chung
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
- Shenzhen Grubbs Institute and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Zhiping Zheng
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
- Shenzhen Grubbs Institute and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
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16
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Abstract
Biomolecules with metal ion(s) (e.g., metalloproteins) play many important biological roles. However, accurate structural determination of metalloproteins, particularly those containing transition metal ion(s), is challenging due to their complicated electronic structure, complex bonding of metal ions, and high number of conformations in biomolecules. Quantum refinement, which was proposed to combine crystallographic data with computational chemistry methods by several groups, can improve the local structures of some proteins. In this study, a quantum refinement method combining several multiscale computational schemes with experimental (X-ray diffraction) information was developed for metalloproteins. Various quantum refinement approaches using different ONIOM (our own N-layered integrated molecular orbital and molecular mechanics) combinations of quantum mechanics (QM), semiempirical (SE), and molecular mechanics (MM) methods were conducted to assess the performance and reliability on the refined local structure in two metalloproteins. The structures for two (Cu- or Zn-containing) metalloproteins were refined by combining two-layer ONIOM2(QM1/QM2) and ONIOM2(QM/MM) and three-layer ONIOM3(QM1/QM2/MM) schemes with experimental data. The accuracy of the quantum-refined metal binding sites was also examined and compared in these multiscale quantum refinement calculations. ONIOM3(QM/SE/MM) schemes were found to give good results with lower computational costs and were proposed to be a good choice for the multiscale computational scheme for quantum refinement calculations of metal binding site(s) in metalloproteins with high efficiency. Additionally, a two-center ONIOM approach was employed to speed up the quantum refinement calculations for the Zn metalloprotein with two remote active sites/ligands. Moreover, a recent quantum-embedding wavefunction-in-density functional theory (WF-in-DFT) method was also adopted as the high-level method in unprecedented ONIOM2(CCSD-in-B3LYP/MM) and ONIOM3(CCSD-in-B3LYP/SE/MM) calculations, which can be regarded as novel pseudo-three- and pseudo-four-layer ONIOM methods, respectively, to refine the key Zn binding site at the coupled-cluster singles and doubles (CCSD) level. These refined results indicate that multiscale quantum refinement schemes can be used to improve the structural accuracy obtained for local metal binding site(s) in metalloproteins with high efficiency.
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Affiliation(s)
- Zeyin Yan
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Xin Li
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
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17
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Fan X, Zheng L, Yang Y, Dong X, Zhang X, Chung LW. A Computational Study of Asymmetric Hydrogenation of
2‐Phenyl
Acrylic Acids Catalyzed by a Rh(I) Catalyst with Ferrocenyl Chiral Bisphosphorus Ligand: The Role of
Ion‐Pair
Interaction
†. CHINESE J CHEM 2021. [DOI: 10.1002/cjoc.202000741] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xiangru Fan
- Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis and Shenzhen Grubbs Institute Southern University of Science and Technology Shenzhen Guangdong 518055 China
| | - Lini Zheng
- Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis and Shenzhen Grubbs Institute Southern University of Science and Technology Shenzhen Guangdong 518055 China
| | - Yuhong Yang
- Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis and Shenzhen Grubbs Institute Southern University of Science and Technology Shenzhen Guangdong 518055 China
| | - Xiu‐Qin Dong
- Key Laboratory of Biomedical Polymers, Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University Wuhan Hubei 430072 China
| | - Xumu Zhang
- Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis and Shenzhen Grubbs Institute Southern University of Science and Technology Shenzhen Guangdong 518055 China
| | - Lung Wa Chung
- Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis and Shenzhen Grubbs Institute Southern University of Science and Technology Shenzhen Guangdong 518055 China
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18
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Du X, Xiao Y, Yang Y, Duan Y, Li F, Hu Q, Chung LW, Chen G, Zhang X. Enantioselective Hydrogenation of Tetrasubstituted α,β‐Unsaturated Carboxylic Acids Enabled by Cobalt(II) Catalysis: Scope and Mechanistic Insights. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202016705] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Xiaoyong Du
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
| | - Ye Xiao
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
| | - Yuhong Yang
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
| | - Ya‐Nan Duan
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
| | - Fangfang Li
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
| | - Qi Hu
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
| | - Gen‐Qiang Chen
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
- Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen 518000 China
| | - Xumu Zhang
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
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19
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Du X, Xiao Y, Yang Y, Duan Y, Li F, Hu Q, Chung LW, Chen G, Zhang X. Enantioselective Hydrogenation of Tetrasubstituted α,β‐Unsaturated Carboxylic Acids Enabled by Cobalt(II) Catalysis: Scope and Mechanistic Insights. Angew Chem Int Ed Engl 2021; 60:11384-11390. [DOI: 10.1002/anie.202016705] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Indexed: 01/04/2023]
Affiliation(s)
- Xiaoyong Du
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
| | - Ye Xiao
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
| | - Yuhong Yang
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
| | - Ya‐Nan Duan
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
| | - Fangfang Li
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
| | - Qi Hu
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
| | - Gen‐Qiang Chen
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
- Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen 518000 China
| | - Xumu Zhang
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518000 China
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20
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Chang X, Yang Y, Shen C, Xue KS, Wang ZF, Cong H, Tao HY, Chung LW, Wang CJ. β-Substituted Alkenyl Heteroarenes as Dipolarophiles in the Cu(I)-Catalyzed Asymmetric 1,3-Dipolar Cycloaddition of Azomethine Ylides Empowered by a Dual Activation Strategy: Stereoselectivity and Mechanistic Insight. J Am Chem Soc 2021; 143:3519-3535. [DOI: 10.1021/jacs.0c12911] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Xin Chang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People’s Republic of China
- State Key Laboratory of of Elemento-organic Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Yuhong Yang
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, People’s Republic of China
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
| | - Chong Shen
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Kun-Shan Xue
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Zuo-Fei Wang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Hengjiang Cong
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Hai-Yan Tao
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, People’s Republic of China
| | - Chun-Jiang Wang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People’s Republic of China
- State Key Laboratory of of Elemento-organic Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
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21
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Affiliation(s)
- Jian-Hong Fan
- Shenzhen Key Laboratory of Small Molecule Drug Discovery and Synthesis, Department of Chemistry, Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055
- Institute of Chinese Medical Sciences, University of Macau, Macau 999078
| | - Jing-Jing Wang
- Shenzhen Key Laboratory of Small Molecule Drug Discovery and Synthesis, Department of Chemistry, Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055
| | - Fangfang Li
- Shenzhen Key Laboratory of Small Molecule Drug Discovery and Synthesis, Department of Chemistry, Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055
| | - Guannan Wang
- Shenzhen Key Laboratory of Small Molecule Drug Discovery and Synthesis, Department of Chemistry, Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055
| | - Qiang Guo
- Shenzhen Key Laboratory of Small Molecule Drug Discovery and Synthesis, Department of Chemistry, Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055
| | - Lung Wa Chung
- Shenzhen Key Laboratory of Small Molecule Drug Discovery and Synthesis, Department of Chemistry, Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055
| | - Chuang-Chuang Li
- Shenzhen Key Laboratory of Small Molecule Drug Discovery and Synthesis, Department of Chemistry, Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055
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22
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Zhu DX, Xia H, Liu JG, Chung LW, Xu MH. Regiospecific and Enantioselective Arylvinylcarbene Insertion of a C–H Bond of Aniline Derivatives Enabled by a Rh(I)-Diene Catalyst. J Am Chem Soc 2021; 143:2608-2619. [DOI: 10.1021/jacs.0c13191] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Dong-Xing Zhu
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu-chongzhi Road, Shanghai 201203, China
| | - Hui Xia
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, 1088 Xueyuan Boulevard, Shenzhen 518055, China
| | - Jian-Guo Liu
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, 1088 Xueyuan Boulevard, Shenzhen 518055, China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, 1088 Xueyuan Boulevard, Shenzhen 518055, China
| | - Ming-Hua Xu
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, 1088 Xueyuan Boulevard, Shenzhen 518055, China
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu-chongzhi Road, Shanghai 201203, China
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23
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Chen JP, Li Y, Liu C, Wang T, Chung LW, Xu MH. Water as a Direct Proton Source for Asymmetric Hydroarylation Catalyzed by a Rh(I)-Diene: Access to Nonproteinogenic β 2/γ 2/δ 2-Amino Acid Derivatives. Org Lett 2021; 23:571-577. [PMID: 33373250 DOI: 10.1021/acs.orglett.0c04099] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A highly enantioselective rhodium-catalyzed intermolecular hydroarylation of α-aminoalkyl acrylates using water as a direct proton source has been realized by employing a chiral bicyclo[3.3.0] diene ligand, allowing efficient access to a broad range of α-aryl-methyl-substituted β2-, γ2-, and δ2-amino esters with excellent enantioselectivities (up to 98% ee) under exceptionally mild conditions. By utilizing this method, a series of structurally interesting benzo-fused heterocyclic molecules and the corresponding β2-, γ2-, and δ2-amino acids are facilely constructed.
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Affiliation(s)
- Jian-Ping Chen
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu-chongzhi Road, Shanghai 201203, China
| | - Yi Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu-chongzhi Road, Shanghai 201203, China
| | - Chao Liu
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, 1088 Xueyuan Boulevard, Shenzhen 518055, China
| | - Tianyi Wang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu-chongzhi Road, Shanghai 201203, China.,Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, 1088 Xueyuan Boulevard, Shenzhen 518055, China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, 1088 Xueyuan Boulevard, Shenzhen 518055, China
| | - Ming-Hua Xu
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu-chongzhi Road, Shanghai 201203, China.,Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, 1088 Xueyuan Boulevard, Shenzhen 518055, China
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24
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Feng Q, Wu H, Li X, Song L, Chung LW, Wu YD, Sun J. Ru-Catalyzed Geminal Hydroboration of Silyl Alkynes via a New gem-Addition Mechanism. J Am Chem Soc 2020; 142:13867-13877. [DOI: 10.1021/jacs.0c05334] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Qiang Feng
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, SAR, China
| | - Haonan Wu
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
- Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Xin Li
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Lijuan Song
- Shenzhen Bay Laboratory, Shenzhen 518055, China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yun-Dong Wu
- Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
- Shenzhen Bay Laboratory, Shenzhen 518055, China
- College of Chemistry, Peking University, Beijing 100871, China
| | - Jianwei Sun
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, SAR, China
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25
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Zhang X, Wu SB, Leng X, Chung LW, Liu G, Huang Z. N-Bridged Pincer Iridium Complexes for Highly Efficient Alkane Dehydrogenation and the Relevant Linker Effects. ACS Catal 2020. [DOI: 10.1021/acscatal.0c00539] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Xin Zhang
- The State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Song-Bai Wu
- Department of Chemistry, Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, China
| | - Xuebing Leng
- The State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Lung Wa Chung
- Department of Chemistry, Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, China
| | - Guixia Liu
- The State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
- Chang-Kung Chuang Institute, East China Normal University, Shanghai 200062, China
| | - Zheng Huang
- The State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
- Chang-Kung Chuang Institute, East China Normal University, Shanghai 200062, China
- School of Chemistry and Material Sciences, Hangzhou Institute of Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou 310024, China
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26
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Wan Asyraf WZ, Ah Khan YK, Chung LW, Kee HF, Irene L, Ang CL, Choon WK, Mak CS, Tan WY, Wn Nafisah WY, Hamidon B. Malaysia Stroke Council guide on acute stroke care service during COVID-19 Pandemic. Med J Malaysia 2020; 75:311-313. [PMID: 32467554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
On the 18th of March 2020, the Malaysia government declared a movement control order (MCO) due to the unprecedented COVID-19 pandemic. Although the majority of patients presented with respiratory-related symptoms, COVID-19 patients may present atypically with neurological manifestations and may even have an increased risk of stroke. The Malaysia Stroke Council is concerned regarding the level of care given to stroke patients during this pandemic. During the recent National Stroke Workflow Steering Committee meeting, a guide was made based on the currently available evidences to assist Malaysian physicians providing acute stroke care in the hospital setting in order to provide the best stroke care while maintaining their own safety. The guide comprises of prehospital stroke awareness, hyperacute stroke care, stroke care unit and intensive care unit admission, post-stroke rehabilitation and secondary prevention practice. We urge continuous initiative to provide the best stroke care possible and ensure adequate safety for both patients and the stroke care team.
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Affiliation(s)
- W Z Wan Asyraf
- Pusat Perubatan Universiti Kebangsaan Malaysia, Department of Medicine, Malaysia.
| | - Y K Ah Khan
- University Putra Malaysia, Faculty of Medicine and Health Sciences, Department of Medicine, Selangor, Malaysia
| | - L W Chung
- Hospital Umum Sarawak, Kuching, Sarawak, Malaysia
| | - H F Kee
- University Putra Malaysia, Faculty of Medicine and Health Sciences, Department of Medicine, Selangor, Malaysia
| | - L Irene
- Hospital Seberang Jaya, Pulau Pinang, Malaysia
| | - C L Ang
- Hospital Pantai Ipoh, Perak, Malaysia
| | - W K Choon
- Hospital Pantai Pulau Pinang, Malaysia
| | - C S Mak
- Hospital Gleneagles Kuala Lumpur, Malaysia
| | - W Y Tan
- Thomson Hospital, Kuala Lumpur, Malaysia
| | - W Y Wn Nafisah
- Pusat Perubatan Universiti Kebangsaan Malaysia, Department of Medicine, Malaysia
| | - B Hamidon
- University Putra Malaysia, Faculty of Medicine and Health Sciences, Department of Medicine, Selangor, Malaysia
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27
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Yang Y, Zhang X, Zhong LP, Lan J, Li X, Li CC, Chung LW. Unusual KIE and dynamics effects in the Fe-catalyzed hetero-Diels-Alder reaction of unactivated aldehydes and dienes. Nat Commun 2020; 11:1850. [PMID: 32296076 PMCID: PMC7160212 DOI: 10.1038/s41467-020-15599-w] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 03/13/2020] [Indexed: 12/30/2022] Open
Abstract
Hetero-Diels-Alder (HDA) reaction is an important synthetic method for many natural products. An iron(III) catalyst was developed to catalyze the challenging HDA reaction of unactivated aldehydes and dienes with high selectivity. Here we report extensive density-functional theory (DFT) calculations and molecular dynamics simulations that show effects of iron (including its coordinate mode and/or spin state) on the dynamics of this reaction: considerably enhancing dynamically stepwise process, broadening entrance channel and narrowing exit channel from concerted asynchronous transition states. Also, our combined computational and experimental secondary KIE studies reveal unexpectedly large KIE values for the five-coordinate pathway even with considerable C-C bond forming, due to equilibrium isotope effect from the change in the metal coordination. Moreover, steric and electronic effects are computationally shown to dictate the C=O chemoselectivity for an α,β-unsaturated aldehyde, which is verified experimentally. Our mechanistic study may help design homogeneous, heterogeneous and biological catalysts for this challenging reaction.
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Affiliation(s)
- Yuhong Yang
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Xiaoyong Zhang
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Li-Ping Zhong
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Jialing Lan
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Xin Li
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Chuang-Chuang Li
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China.
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28
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Li F, Chung LW. AgN 3-Catalyzed Hydroazidation of Terminal Alkynes and Mechanistic Studies. CHINESE J ORG CHEM 2020. [DOI: 10.6023/cjoc202000054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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29
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Sun XS, Ou-Yang Q, Xu SM, Wang XH, Tao HY, Chung LW, Wang CJ. Asymmetric synthesis of quaternary α-trifluoromethyl α-amino acids by Ir-catalyzed allylation followed by kinetic resolution. Chem Commun (Camb) 2020; 56:3333-3336. [DOI: 10.1039/d0cc00845a] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Facile access to quaternary α-trifluoromethyl α-amino acids has been developed. This sequential reaction involves an Ir-catalyzed asymmetric allylation of α-trifluoromethyl aldimine esters followed by an unprecedented kinetic resolution.
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Affiliation(s)
- Xi-Shang Sun
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
- China
- State Key Laboratory of Organometallic Chemistry
| | - Qiu Ou-Yang
- Department of Chemistry and Shenzhen Grubbs Institute
- Southern University of Science and Technology (SUSTech)
- Shenzhen
- China
| | - Shi-Ming Xu
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
- China
| | - Xing-Heng Wang
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
- China
| | - Hai-Yan Tao
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
- China
| | - Lung Wa Chung
- Department of Chemistry and Shenzhen Grubbs Institute
- Southern University of Science and Technology (SUSTech)
- Shenzhen
- China
| | - Chun-Jiang Wang
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
- China
- State Key Laboratory of Organometallic Chemistry
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30
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Song L, Feng Q, Wang Y, Ding S, Wu YD, Zhang X, Chung LW, Sun J. Ru-Catalyzed Migratory Geminal Semihydrogenation of Internal Alkynes to Terminal Olefins. J Am Chem Soc 2019; 141:17441-17451. [DOI: 10.1021/jacs.9b09658] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Lijuan Song
- Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany
| | - Qiang Feng
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Yong Wang
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Shengtao Ding
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Yun-Dong Wu
- Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
- Shenzhen Bay Laboratory, Shenzhen 518055, China
- College of Chemistry, Peking University, Beijing 100871, China
| | - Xinhao Zhang
- Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
- Shenzhen Bay Laboratory, Shenzhen 518055, China
| | - Lung Wa Chung
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jianwei Sun
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
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31
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Tu B, Shao Y, Chen W, Wu Y, Li X, He Y, Li J, Liu F, Zhang Z, Lin Y, Lan X, Xu L, Shi X, Ng AMC, Li H, Chung LW, Djurišić AB, He Z. Novel Molecular Doping Mechanism for n-Doping of SnO 2 via Triphenylphosphine Oxide and Its Effect on Perovskite Solar Cells. Adv Mater 2019; 31:e1805944. [PMID: 30697836 DOI: 10.1002/adma.201805944] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 12/10/2018] [Indexed: 06/09/2023]
Abstract
Molecular doping of inorganic semiconductors is a rising topic in the field of organic/inorganic hybrid electronics. However, it is difficult to find dopant molecules which simultaneously exhibit strong reducibility and stability in ambient atmosphere, which are needed for n-type doping of oxide semiconductors. Herein, successful n-type doping of SnO2 is demonstrated by a simple, air-robust, and cost-effective triphenylphosphine oxide molecule. Strikingly, it is discovered that electrons are transferred from the R3P+ O- σ-bond to the peripheral tin atoms other than the directly interacted ones at the surface. That means those electrons are delocalized. The course is verified by multi-photophysical characterizations. This doping effect accounts for the enhancement of conductivity and the decline of work function of SnO2 , which enlarges the built-in field from 0.01 to 0.07 eV and decreases the energy barrier from 0.55 to 0.39 eV at the SnO2 /perovskite interface enabling an increase in the conversion efficiency of perovskite solar cells from 19.01% to 20.69%.
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Affiliation(s)
- Bao Tu
- Department of Materials Science and Engineering, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
- Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, 999078, Macau SAR, China
| | - Yangfan Shao
- Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, 999078, Macau SAR, China
- Department of Physics, Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
| | - Wei Chen
- Department of Materials Science and Engineering, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
- Department of Physics, The University of Hong Kong, Pokfulam, 999077, Hong Kong SAR, China
| | - Yinghui Wu
- Department of Materials Science and Engineering, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
| | - Xin Li
- Department of Materials Science and Engineering, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
- Department of Chemistry, Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
| | - Yanling He
- Department of Materials Science and Engineering, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
- Department of Physics, Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
| | - Jiaxing Li
- Department of Materials Science and Engineering, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
- Department of Physics, Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
| | - Fangzhou Liu
- Department of Physics, The University of Hong Kong, Pokfulam, 999077, Hong Kong SAR, China
| | - Zheng Zhang
- Department of Materials Science and Engineering, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
| | - Yi Lin
- Department of Materials Science and Engineering, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
| | - Xiaoqi Lan
- Department of Materials Science and Engineering, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
| | - Leiming Xu
- Department of Materials Science and Engineering, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
| | - Xingqiang Shi
- Department of Physics, Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
| | - Alan Man Ching Ng
- Department of Physics, Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
| | - Haifeng Li
- Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, 999078, Macau SAR, China
| | - Lung Wa Chung
- Department of Chemistry, Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
| | - Aleksandra B Djurišić
- Department of Physics, The University of Hong Kong, Pokfulam, 999077, Hong Kong SAR, China
| | - Zhubing He
- Department of Materials Science and Engineering, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
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Abstract
The first asymmetric total synthesis of the highly strained compound cerorubenic acid-III is reported. A type II intramolecular [5 + 2] cycloaddition allowed efficient and diastereoselective construction of the synthetically challenging bicyclo[4.4.1] ring system with a strained bridgehead (anti-Bredt) double bond in the final product. A unique transannular cyclization installed the vinylcyclopropane moiety with retention of the desired stereochemistry.
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Affiliation(s)
- Xin Liu
- Shenzhen Grubbs Institute, Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China.,Institute of Chinese Medical Sciences , University of Macau , Macau , China
| | - Junyang Liu
- Shenzhen Grubbs Institute, Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China.,Academy for Advanced Interdisciplinary Studies , Southern University of Science and Technology (SUSTech) , Shenzhen 518055 , China
| | - Jianlei Wu
- Shenzhen Grubbs Institute, Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Guocheng Huang
- Shenzhen Grubbs Institute, Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Rong Liang
- Shenzhen Grubbs Institute, Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute, Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Chuang-Chuang Li
- Shenzhen Grubbs Institute, Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China
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33
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Wu SB, Zhang T, Chung LW, Wu YD. A Missing Piece of the Mechanism in Metal-Catalyzed Hydrogenation: Co(-I)/Co(0)/Co(+I) Catalytic Cycle for Co(-I)-Catalyzed Hydrogenation. Org Lett 2019; 21:360-364. [PMID: 30600680 DOI: 10.1021/acs.orglett.8b03463] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Hydrogenation catalyzed by unusually low-valent Co(-I) and Fe(-I) catalysts were recently reported. In contrast to the classical M(I)/M(III) (M = Rh or Ir) or Ir(III)/Ir(V) catalytic cycles in the singlet state (adiabatic reactions) for Rh- or Ir-catalyzed hydrogenation, our systematic DFT study elucidates a new Co(-I)/Co(0)/Co(+I) catalytic cycle involving both singlet and triplet states (nonadiabatic reaction). Also, the more electron-rich cobalt center of the Co(-I) catalyst was found to contribute higher reactivity for alkene hydrogenation.
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Affiliation(s)
- Song-Bai Wu
- Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics , Peking University Shenzhen Graduate School , Shenzhen 518055 , China.,Department of Chemistry and Shenzhen Grubbs Institute , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Tonghuan Zhang
- Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics , Peking University Shenzhen Graduate School , Shenzhen 518055 , China.,Department of Chemistry and Shenzhen Grubbs Institute , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Lung Wa Chung
- Department of Chemistry and Shenzhen Grubbs Institute , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Yun-Dong Wu
- Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics , Peking University Shenzhen Graduate School , Shenzhen 518055 , China.,College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
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34
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Shen C, Yang Y, Wei L, Dong WW, Chung LW, Wang CJ. Kinetic Resolution of Alkylidene Norcamphors via a Ligand-Controlled Umpolung-Type 1,3-Dipolar Cycloaddition. iScience 2018; 11:146-159. [PMID: 30612034 PMCID: PMC6317281 DOI: 10.1016/j.isci.2018.12.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 11/15/2018] [Accepted: 12/10/2018] [Indexed: 11/30/2022] Open
Abstract
Development of a general catalytic and highly efficient method utilizing readily available precursors for the regio- and stereoselective construction of bioactive natural-product-inspired spiro architectures remains a formidable challenge in chemical research. Transition metal-catalyzed asymmetric 1,3-dipolar cycloaddition of azomethine ylides produces numerous N-heterocycles, but reaction control with the regioselectivity opposite to the conventional fashion has rarely been demonstrated. Herein, we report a unique ligand-controlled Cu(I)-catalyzed umpolung-type 1,3-dipolar cycloaddition of azomethine ylide to realize efficient kinetic resolution of racemic alkylidene norcamphors with the concomitant construction of previously inaccessible spiro N-heterocycles with high levels of regio- and stereoselectivity. The success of this methodology relies on the strategy of kinetic resolution, and the serendipitous discovery of a unique ligand-enabled regiospecific cycloaddition, which not only provides evidence for the existence of the minor zwitterionic resonance form in metallated azomethine ylide but also diversifies the existing chemistry of azomethine ylide-involved 1,3-dipolar cycloadditions with rare polarity inversion. Kinetic resolution of racemic alkylidene norcamphors Spiro architectures incorporating norbornane and pyrrolidine scaffolds Unique ligand-enabled umpolung-type 1,3-dipolar cycloaddition
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Affiliation(s)
- Chong Shen
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China; State Key Laboratory of Elemento-organic Chemistry, Nankai University, Tianjin 300071, China
| | - Yuhong Yang
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China; Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, China
| | - Liang Wei
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Wu-Wei Dong
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Lung Wa Chung
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, China.
| | - Chun-Jiang Wang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China; State Key Laboratory of Elemento-organic Chemistry, Nankai University, Tianjin 300071, China.
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35
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Zhu C, Huang M, Lan J, Chung LW, Li X, Xie X. Colorimetric Calcium Probe with Comparison to an Ion-Selective Optode. ACS Omega 2018; 3:12476-12481. [PMID: 31457978 PMCID: PMC6644788 DOI: 10.1021/acsomega.8b01813] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 09/20/2018] [Indexed: 06/10/2023]
Abstract
Design strategies for small molecular probes lay the foundation of numerous synthetic chemosensors. A water-soluble colorimetric calcium molecular probe inspired by the ionophore-based ion-selective optode is presented here with a tunable detection range (around micromolar at pH 7). The binding of Ca2+ resulted in the deprotonation of the probe and thus a significant spectral change, mimicking the ion-exchange process in ion-selective optodes. The 1:1 exchange between Ca2+ and H+ was confirmed with Job's plot. Computational studies revealed possible monomer and dimer forms of the probe-Ca2+ complexes.
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36
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Wen J, Fan X, Tan R, Chien HC, Zhou Q, Chung LW, Zhang X. Correction to Brønsted-Acid-Promoted Rh-Catalyzed Asymmetric Hydrogenation of N-Unprotected Indoles: A Cocatalysis of Transition Metal and Anion Binding. Org Lett 2018; 20:4390. [DOI: 10.1021/acs.orglett.8b01912] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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37
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Zhou Q, Tang W, Chung LW. Mechanistic insights into asymmetric reductive coupling of isoquinolines by a chiral diboron with DFT calculations. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.02.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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38
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Wen J, Fan X, Tan R, Chien HC, Zhou Q, Chung LW, Zhang X. Brønsted-Acid-Promoted Rh-Catalyzed Asymmetric Hydrogenation of N-Unprotected Indoles: A Cocatalysis of Transition Metal and Anion Binding. Org Lett 2018; 20:2143-2147. [DOI: 10.1021/acs.orglett.8b00312] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Jialin Wen
- Department of Chemistry, Southern University of Science and Technology (SUSTech), 1088 Xueyuan Road, Shenzhen 518055, China
- Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, 1088 Xueyuan Road, Shenzhen 518055, China
| | - Xiangru Fan
- Department of Chemistry, Southern University of Science and Technology (SUSTech), 1088 Xueyuan Road, Shenzhen 518055, China
| | - Renchang Tan
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Hui-Chun Chien
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Qinghai Zhou
- Department of Chemistry, Southern University of Science and Technology (SUSTech), 1088 Xueyuan Road, Shenzhen 518055, China
| | - Lung Wa Chung
- Department of Chemistry, Southern University of Science and Technology (SUSTech), 1088 Xueyuan Road, Shenzhen 518055, China
| | - Xumu Zhang
- Department of Chemistry, Southern University of Science and Technology (SUSTech), 1088 Xueyuan Road, Shenzhen 518055, China
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39
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You C, Li S, Li X, Lan J, Yang Y, Chung LW, Lv H, Zhang X. Design and Application of Hybrid Phosphorus Ligands for Enantioselective Rh-Catalyzed Anti-Markovnikov Hydroformylation of Unfunctionalized 1,1-Disubstituted Alkenes. J Am Chem Soc 2018; 140:4977-4981. [DOI: 10.1021/jacs.8b00275] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Cai You
- Key Laboratory of Biomedical Polymers of Ministry of Education & College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China
| | - Shuailong Li
- Key Laboratory of Biomedical Polymers of Ministry of Education & College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China
| | - Xiuxiu Li
- Key Laboratory of Biomedical Polymers of Ministry of Education & College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China
| | - Jialing Lan
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Yuhong Yang
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Lung Wa Chung
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Hui Lv
- Key Laboratory of Biomedical Polymers of Ministry of Education & College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China
- Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China
| | - Xumu Zhang
- Key Laboratory of Biomedical Polymers of Ministry of Education & College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
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40
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Zhang T, Zhang X, Chung LW. Computational Insights into the Reaction Mechanisms of Nickel-Catalyzed Hydrofunctionalizations and Nickel-Dependent Enzymes. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201700645] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Tonghuan Zhang
- Department of Chemistry; South University of Science and Technology of China (SUSTech); Shenzhen 518055 China
- Lab of Computational Chemistry and Drug Design; Key Laboratory of Chemical Genomics; Peking University Shenzhen Graduate School; Shenzhen 518055 China
| | - Xiaoyong Zhang
- Department of Chemistry; South University of Science and Technology of China (SUSTech); Shenzhen 518055 China
| | - Lung Wa Chung
- Department of Chemistry; South University of Science and Technology of China (SUSTech); Shenzhen 518055 China
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41
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Li X, You C, Yang Y, Yang Y, Li P, Gu G, Chung LW, Lv H, Zhang X. Rhodium-catalyzed asymmetric hydrogenation of β-cyanocinnamic esters with the assistance of a single hydrogen bond in a precise position. Chem Sci 2018; 9:1919-1924. [PMID: 29675238 PMCID: PMC5890790 DOI: 10.1039/c7sc04639a] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 01/02/2018] [Indexed: 12/24/2022] Open
Abstract
The first asymmetric hydrogenation of β-cyanoacrylate esters has been developed to furnish chiral β-cyano esters with excellent yields and excellent enantioselectivities. Notably, the catalyst with a single H-bond donor in a precise position performed better than that with double H-bond donors.
With the assistance of hydrogen bonds, the first asymmetric hydrogenation of β-cyanocinnamic esters is developed, affording chiral β-cyano esters with excellent enantioselectivities (up to 99% ee). This novel methodology provides an efficient and concise synthetic route to chiral GABA-derivatives such as (S)-Pregabalin, (R)-Phenibut, (R)-Baclofen. Interestingly, in this system, the catalyst with a single H-bond donor performs better than that with double H-bond donors, which is a novel discovery in the metalorganocatalysis area.
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Affiliation(s)
- Xiuxiu Li
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , Hubei 430072 , P. R. China .
| | - Cai You
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , Hubei 430072 , P. R. China .
| | - Yusheng Yang
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , Hubei 430072 , P. R. China .
| | - Yuhong Yang
- Department of Chemistry , Southern University of Science and Technology , Shenzhen , Guangdong 518055 , P. R. China .
| | - Pan Li
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , Hubei 430072 , P. R. China .
| | - Guoxian Gu
- Department of Chemistry , Southern University of Science and Technology , Shenzhen , Guangdong 518055 , P. R. China .
| | - Lung Wa Chung
- Department of Chemistry , Southern University of Science and Technology , Shenzhen , Guangdong 518055 , P. R. China .
| | - Hui Lv
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , Hubei 430072 , P. R. China . .,Engineering Research Center of Organosilicon Compounds & Materials , Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , 430072 , China
| | - Xumu Zhang
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , Hubei 430072 , P. R. China . .,Department of Chemistry , Southern University of Science and Technology , Shenzhen , Guangdong 518055 , P. R. China .
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42
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Tan X, Zeng W, Zhang X, Wa Chung L, Zhang X. Correction: Development of a novel secondary phosphine oxide–ruthenium( ii) catalyst and its application for carbonyl reduction. Chem Commun (Camb) 2018; 54:5248. [DOI: 10.1039/c8cc90205d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Correction for ‘Development of a novel secondary phosphine oxide–ruthenium(ii) catalyst and its application for carbonyl reduction’ by Xuefeng Tan et al., Chem. Commun., 2018, 54, 535–538.
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Affiliation(s)
- Xuefeng Tan
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- P. R. China
| | - Weijun Zeng
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- P. R. China
| | - Xiaoyong Zhang
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- P. R. China
| | - Lung Wa Chung
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- P. R. China
| | - Xumu Zhang
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- P. R. China
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43
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Tan X, Zeng W, Zhang X, Chung LW, Zhang X. Development of a novel secondary phosphine oxide–ruthenium(ii) catalyst and its application for carbonyl reduction. Chem Commun (Camb) 2018; 54:535-538. [DOI: 10.1039/c7cc07647a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A secondary phosphine oxide–phosphine mixed tridentate ligand and its ruthenium complex have been developed.
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Affiliation(s)
- Xuefeng Tan
- Department of Chemistry, Southern University of Science and Technology
- Shenzhen
- P. R. China
| | - Weijun Zeng
- Department of Chemistry, Southern University of Science and Technology
- Shenzhen
- P. R. China
| | - Xiaoyong Zhang
- Department of Chemistry, Southern University of Science and Technology
- Shenzhen
- P. R. China
| | - Lung Wa Chung
- Department of Chemistry, Southern University of Science and Technology
- Shenzhen
- P. R. China
| | - Xumu Zhang
- Department of Chemistry, Southern University of Science and Technology
- Shenzhen
- P. R. China
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44
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Jin MY, Li J, Huang R, Zhou Y, Chung LW, Wang J(J. Catalytic asymmetric trifluoromethylthiolation of carbonyl compounds via a diastereo and enantioselective Cu-catalyzed tandem reaction. Chem Commun (Camb) 2018; 54:4581-4584. [DOI: 10.1039/c8cc02097c] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The tandem reaction realizes the asymmetric integration of –SCF3 group to carbonyl compounds, establishing the chiral tertiary α-carbon center and affording the α-SCF3-β-substituted carbonyl compounds in 50–92% yields with up to 20 : 1 dr and 96% ee.
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Affiliation(s)
- Ming Yu Jin
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- Guangdong
- China
| | - Juncheng Li
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- Guangdong
- China
| | - Renke Huang
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- Guangdong
- China
| | - Yuxuan Zhou
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- Guangdong
- China
| | - Lung Wa Chung
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- Guangdong
- China
| | - Jun (Joelle) Wang
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- Guangdong
- China
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45
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Li X, Liao T, Chung LW. Computational Prediction of Excited-State Carbon Tunneling in the Two Steps of Triplet Zimmerman Di-π-Methane Rearrangement. J Am Chem Soc 2017; 139:16438-16441. [PMID: 29037035 DOI: 10.1021/jacs.7b07539] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The photoinduced Zimmerman di-π-methane (DPM) rearrangement of polycyclic molecules to form synthetically useful cyclopropane derivatives was found experimentally to proceed in a triplet excited state. We have applied state-of-the-art quantum mechanical methods, including M06-2X, DLPNO-CCSD(T) and variational transition-state theory with multidimensional tunneling corrections, to an investigation of the reaction rates of the two steps in the triplet DPM rearrangement of dibenzobarrelene, benzobarrelene and barrelene. This study predicts a high probability of carbon tunneling in regions around the two consecutive transition states at 200-300 K, and an enhancement in the rates by 104-276/35-67% with carbon tunneling at 200/300 K. The Arrhenius plots of the rate constants were found to be curved at low temperatures. Moreover, the computed 12C/13C kinetic isotope effects were affected significantly by carbon tunneling and temperature. Our predictions of electronically excited-state carbon tunneling and two consecutive carbon tunneling are unprecedented. Heavy-atom tunneling in some photoinduced reactions with reactive intermediates and narrow barriers can be potentially observed at relatively low temperature in experiments.
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Affiliation(s)
- Xin Li
- Department of Chemistry, South University of Science and Technology of China , Shenzhen 518055, China
| | - Tao Liao
- Department of Chemistry, South University of Science and Technology of China , Shenzhen 518055, China
| | - Lung Wa Chung
- Department of Chemistry, South University of Science and Technology of China , Shenzhen 518055, China
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46
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Gao W, Lv H, Zhang T, Yang Y, Chung LW, Wu YD, Zhang X. Nickel-catalyzed asymmetric hydrogenation of β-acylamino nitroolefins: an efficient approach to chiral amines. Chem Sci 2017; 8:6419-false. [PMID: 29163927 PMCID: PMC5632792 DOI: 10.1039/c7sc02669b] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Accepted: 07/02/2017] [Indexed: 12/16/2022] Open
Abstract
An efficient approach for synthesizing chiral β-amino nitroalkanes has been developed via the Ni-catalyzed asymmetric hydrogenation of challenging β-amino nitroolefins under mild conditions, affording the desired products in excellent yields and with high enantioselectivities. This protocol had good compatibility with the wide substrate scope and a range of functional groups. The synthesis of chiral β-amino nitroalkanes on a gram scale has also been achieved. In addition, the reaction mechanism was elucidated using a combined experimental and computational study, and it involved acetate-assisted heterolytic H2 cleavage followed by 1,4-hydride addition and protonation to achieve the nitroalkanes.
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Affiliation(s)
- Wenchao Gao
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , 430072 , China .
| | - Hui Lv
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , 430072 , China .
- Engineering Research Center of Organosilicon Compounds & Materials , Ministry of Education , Wuhan , 430072 , China
| | - Tonghuan Zhang
- Department of Chemistry , South University of Science and Technology of China , Shenzhen , 518055 , China . ;
- Lab of Computational Chemistry and Drug Design , Laboratory of Chemical Genomics , Peking University Shenzhen Graduate School , Shenzhen 518055 , China
| | - Yuhong Yang
- Department of Chemistry , South University of Science and Technology of China , Shenzhen , 518055 , China . ;
| | - Lung Wa Chung
- Department of Chemistry , South University of Science and Technology of China , Shenzhen , 518055 , China . ;
| | - Yun-Dong Wu
- Lab of Computational Chemistry and Drug Design , Laboratory of Chemical Genomics , Peking University Shenzhen Graduate School , Shenzhen 518055 , China
| | - Xumu Zhang
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , 430072 , China .
- Department of Chemistry , South University of Science and Technology of China , Shenzhen , 518055 , China . ;
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47
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Chen D, Xu G, Zhou Q, Chung LW, Tang W. Practical and Asymmetric Reductive Coupling of Isoquinolines Templated by Chiral Diborons. J Am Chem Soc 2017; 139:9767-9770. [DOI: 10.1021/jacs.7b04256] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dongping Chen
- School
of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China
| | - Guangqing Xu
- State
Key Laboratory of Bio-Organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling Ling Road, Shanghai 200032, China
| | - Qinghai Zhou
- Department
of Chemistry, South University of Science and Technology of China, Shenzhen 518055, China
- College
of Chemistry, Nankai University, Tianjin 300071, China
| | - Lung Wa Chung
- Department
of Chemistry, South University of Science and Technology of China, Shenzhen 518055, China
| | - Wenjun Tang
- School
of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China
- State
Key Laboratory of Bio-Organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling Ling Road, Shanghai 200032, China
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48
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Du K, Yang H, Guo P, Feng L, Xu G, Zhou Q, Chung LW, Tang W. Efficient syntheses of (-)-crinine and (-)-aspidospermidine, and the formal synthesis of (-)-minfiensine by enantioselective intramolecular dearomative cyclization. Chem Sci 2017; 8:6247-6256. [PMID: 28989658 PMCID: PMC5628388 DOI: 10.1039/c7sc01859b] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Accepted: 06/30/2017] [Indexed: 11/21/2022] Open
Abstract
Palladium-catalyzed enantioselective dearomative cyclization has enabled the concise and enantioselective total syntheses of (–)-crinine and (–)-aspidospermidine, as well as a formal total synthesis of (–)-minfiensine.
Polycyclic alkaloids bearing all-carbon quaternary centers possess a diversity of biological activities and are challenging targets in natural product synthesis. The development of a general and asymmetric catalytic method applicable to the efficient syntheses of a series of complex polycyclic alkaloids remains highly desirable in synthetic chemistry. Herein we describe an efficient palladium-catalyzed enantioselective dearomative cyclization which is capable of synthesizing two important classes of tricyclic nitrogen-containing skeleton, chiral dihydrophenanthridinone and dihydrocarbazolone derivatives bearing all-carbon quaternary centers, in excellent yields and enantioselectivities. The P-chiral monophosphorus ligand AntPhos is crucial for the reactivity and enantioselectivity, and the choice of the N-phosphoramide protecting group is essential for the desired chemoselectivity. This method has enabled the enantioselective total syntheses of three distinctive and challenging biologically important polycyclic alkaloids, specifically a concise and gram-scale synthesis of (–)-crinine, an efficient synthesis of indole alkaloid (–)-aspidospermidine and a formal enantioselective synthesis of (–)-minfiensine.
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Affiliation(s)
- Kang Du
- State Key Laboratory of Bio-Organic & Natural Products Chemistry , Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China .
| | - He Yang
- State Key Laboratory of Bio-Organic & Natural Products Chemistry , Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China .
| | - Pan Guo
- State Key Laboratory of Bio-Organic & Natural Products Chemistry , Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China .
| | - Liang Feng
- State Key Laboratory of Bio-Organic & Natural Products Chemistry , Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China .
| | - Guangqing Xu
- State Key Laboratory of Bio-Organic & Natural Products Chemistry , Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China .
| | - Qinghai Zhou
- Department of Chemistry , South University of Science and Technology of China , Shenzhen 518055 , China.,College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Lung Wa Chung
- Department of Chemistry , South University of Science and Technology of China , Shenzhen 518055 , China
| | - Wenjun Tang
- State Key Laboratory of Bio-Organic & Natural Products Chemistry , Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China .
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49
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Liu J, Nie M, Zhou Q, Gao S, Jiang W, Chung LW, Tang W, Ding K. Enantioselective palladium-catalyzed diboration of 1,1-disubstituted allenes. Chem Sci 2017; 8:5161-5165. [PMID: 28970901 PMCID: PMC5615263 DOI: 10.1039/c7sc01254c] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 05/07/2017] [Indexed: 11/21/2022] Open
Abstract
A practical and enantioselective palladium-catalyzed diboration of 1,1-disubstituted allenes is developed by employing a P-chiral monophosphorus ligand, BI-DIME. A series of diboronic esters containing a chiral tertiary boronic ester moiety are formed in excellent yields and ee's with the palladium loading as low as 0.2 mol%. DFT calculations revealed a concerted mechanism of oxidative addition of bis(pinacolato)diboron and allene insertion, as well as a critical dispersion effect on the origins of the enantioselectivity. The method is successfully applied to the concise and enantioselective synthesis of brassinazole.
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Affiliation(s)
- Jiawang Liu
- State Key Laboratory of Organometallic Chemistry , State Key Laboratory of Bio-Organic and Natural Products Chemistry , Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , 345 Ling Ling Rd , Shanghai 200032 , China . ;
| | - Ming Nie
- State Key Laboratory of Organometallic Chemistry , State Key Laboratory of Bio-Organic and Natural Products Chemistry , Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , 345 Ling Ling Rd , Shanghai 200032 , China . ;
| | - Qinghai Zhou
- Department of Chemistry , South University of Science and Technology of China , Shenzhen 518055 , China .
- Collaborative Innovation Center of Chemical Science and Engineering , Tianjin 300071 , China
| | - Shen Gao
- State Key Laboratory of Organometallic Chemistry , State Key Laboratory of Bio-Organic and Natural Products Chemistry , Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , 345 Ling Ling Rd , Shanghai 200032 , China . ;
| | - Wenhao Jiang
- State Key Laboratory of Organometallic Chemistry , State Key Laboratory of Bio-Organic and Natural Products Chemistry , Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , 345 Ling Ling Rd , Shanghai 200032 , China . ;
| | - Lung Wa Chung
- Department of Chemistry , South University of Science and Technology of China , Shenzhen 518055 , China .
| | - Wenjun Tang
- State Key Laboratory of Organometallic Chemistry , State Key Laboratory of Bio-Organic and Natural Products Chemistry , Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , 345 Ling Ling Rd , Shanghai 200032 , China . ;
| | - Kuiling Ding
- State Key Laboratory of Organometallic Chemistry , State Key Laboratory of Bio-Organic and Natural Products Chemistry , Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , 345 Ling Ling Rd , Shanghai 200032 , China . ;
- University of Chinese Academy of Sciences , Beijing 100049 , China
- Collaborative Innovation Center of Chemical Science and Engineering , Tianjin 300071 , China
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