1
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Rizzo C, Pace A, Pibiri I, Buscemi S, Palumbo Piccionello A. From Conventional to Sustainable Catalytic Approaches for Heterocycles Synthesis. CHEMSUSCHEM 2023:e202301604. [PMID: 38140917 DOI: 10.1002/cssc.202301604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 12/19/2023] [Accepted: 12/22/2023] [Indexed: 12/24/2023]
Abstract
Synthesis of heterocyclic compounds is fundamental for all the research area in chemistry, from drug synthesis to material science. In this framework, catalysed synthetic methods are of great interest to effective reach such important building blocks. In this review, we will report on some selected examples from the last five years, of the major improvement in the field, focusing on the most important conventional catalytic systems, such as transition metals, organocatalysts, to more sustainable ones such as photocatalysts, iodine-catalysed reaction, electrochemical reactions and green innovative methods.
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Affiliation(s)
- Carla Rizzo
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, Italy, University of Palermo, Viale delle Scienze, Ed. 17, 90128, Palermo
| | - Andrea Pace
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, Italy, University of Palermo, Viale delle Scienze, Ed. 17, 90128, Palermo
| | - Ivana Pibiri
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, Italy, University of Palermo, Viale delle Scienze, Ed. 17, 90128, Palermo
| | - Silvestre Buscemi
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, Italy, University of Palermo, Viale delle Scienze, Ed. 17, 90128, Palermo
| | - Antonio Palumbo Piccionello
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, Italy, University of Palermo, Viale delle Scienze, Ed. 17, 90128, Palermo
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2
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Xie F, Zhao J, Ren D, Xue J, Wang J, Zhao Q, Liu L, Liu X. Enantio- and Diastereoselective Copper-Catalyzed Synthesis of Chiral Aziridines with Vicinal Tetrasubstituted Stereocenters. Org Lett 2023; 25:8530-8534. [PMID: 37975634 DOI: 10.1021/acs.orglett.3c03565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
A Cu-catalyzed coupling of cyclic imino esters with 2H-azirines has been developed to synthesize novel optically active aziridines in high yields with excellent levels of diastereo- and enantioselectivities under mild conditions. This novel protocol features a broad substrate scope and good functional group compatibility, and it enriches the existing reaction type of rapid synthesis of optically active aziridines bearing vicinal tetrasubstituted stereogenic carbon centers.
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Affiliation(s)
- Fang Xie
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, People's Republic of China
| | - Jie Zhao
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, People's Republic of China
| | - Deyue Ren
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, People's Republic of China
| | - Jianming Xue
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, People's Republic of China
| | - Jingyi Wang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, People's Republic of China
| | - Qin Zhao
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, People's Republic of China
| | - Lu Liu
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, People's Republic of China
| | - Xiaodan Liu
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, People's Republic of China
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3
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Zhao ZY, Cui M, Irran E, Oestreich M. Copper-Catalyzed Highly Enantioselective Addition of a Silicon Nucleophile to 3-Substituted 2H-Azirines Using an Si-B Reagent. Angew Chem Int Ed Engl 2023; 62:e202215032. [PMID: 36507717 PMCID: PMC10108078 DOI: 10.1002/anie.202215032] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 12/12/2022] [Accepted: 12/12/2022] [Indexed: 12/15/2022]
Abstract
3-Substituted 2H-azirines can be considered strained cyclic ketimines, and highly enantioselective addition reactions of silicon nucleophiles to either acyclic or cyclic ketimines have been elusive so far. The present work closes this gap for those azirines by means of a copper-catalyzed silylation using a silyl boronic ester as a latent silicon nucleophile. The resulting C-silylated, unprotected (N-H) aziridines are obtained in high yields and with excellent enantioselectivities and can be further converted into valuable compounds with hardly any erosion of the enantiomeric excess.
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Affiliation(s)
- Zhi-Yuan Zhao
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623, Berlin, Germany
| | - Ming Cui
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623, Berlin, Germany
| | - Elisabeth Irran
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623, Berlin, Germany
| | - Martin Oestreich
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623, Berlin, Germany
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4
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Electrochemically promoted N-heterocyclic carbene polymer-catalyzed cycloaddition of aldehyde with isocyanide acetate. Sci China Chem 2022. [DOI: 10.1007/s11426-022-1360-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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5
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Suzuki I, Takenaka Y, Morishita Y, Shibata I. One-step Preparation of N-Unprotected Aziridines from 2H-Azirines by Addition of Ketene Silyl Acetals Catalyzed by Lewis Acids. CHEM LETT 2022. [DOI: 10.1246/cl.210589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Itaru Suzuki
- Research Center for Environmental Preservation, Osaka University, 2-4 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Yuya Takenaka
- Research Center for Environmental Preservation, Osaka University, 2-4 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Yoshitaka Morishita
- Research Center for Environmental Preservation, Osaka University, 2-4 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Ikuya Shibata
- Research Center for Environmental Preservation, Osaka University, 2-4 Yamada-oka, Suita, Osaka 565-0871, Japan
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6
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Wang C, Zhou L, Qiu J, Yang K, Song Q. Rh-Catalyzed diastereoselective addition of arylboronic acids to α-keto N-tert-butanesulfinyl aldimines: synthesis of α-amino ketones. Org Chem Front 2022. [DOI: 10.1039/d1qo01721g] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Herein we present a diastereoselective addition of arylboronic acids to α-keto N-tert-butanesulfinyl aldimines catalyzed by a Rh(i) catalyst.
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Affiliation(s)
- Cece Wang
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Lu Zhou
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Jian Qiu
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Kai Yang
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Qiuling Song
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
- Institute of Next Generation Matter Transformation, College of Materials Science Engineering at Huaqiao University, 668 Jimei Boulevard, Xiamen, Fujian, 361021, China
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7
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Yu W, Wang L, Yu X, Luo S. Fluorescent Dye/Nickel Synergistic Catalytic Decarboxylative Carbonylation Reaction. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202110018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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8
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Yasukawa N, Yamanoue A, Takehara T, Suzuki T, Nakamura S. Asymmetric synthesis of tetrasubstituted cyclic amines via aza-Henry reaction using cinchona alkaloid sulfonamide/zinc(II) catalysts. Chem Commun (Camb) 2021; 58:1318-1321. [PMID: 34950940 DOI: 10.1039/d1cc06492d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The first enantioselective aza-Henry reaction of non-activated cyclic iminoesters, derived from cyclic amino acids, has been developed. Good yields and enantioselectivities were observed for the reaction using our original cinchona alkaloid sulfonamide/zinc(II) catalyst. The transition state was proposed to explain the stereoselectivity based on experiments and DFT calculations.
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Affiliation(s)
- Naoki Yasukawa
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan.
| | - Ami Yamanoue
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan.
| | - Tsunayoshi Takehara
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
| | - Takeyuki Suzuki
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
| | - Shuichi Nakamura
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan. .,Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
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9
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Pan YL, Shao YB, Wang J, Liu Z, Chen L, Li X. Kinetic Resolution of 2 H-Azirines by Asymmetric Allylation Reactions. ACS Catal 2021. [DOI: 10.1021/acscatal.1c03875] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yu-Liang Pan
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Ying-Bo Shao
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Jie Wang
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Zhen Liu
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Li Chen
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xin Li
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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10
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Li W, Lv J, Chi YR. N-Heterocyclic carbene catalyzed aza-benzoin reaction for access to α-aminoketone molecules containing benzothiazole fragments. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132311] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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11
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Xu C, Reep C, Jarvis J, Naumann B, Captain B, Takenaka N. Asymmetric Catalytic Ketimine Mannich Reactions and Related Transformations. Catalysts 2021; 11:712. [PMID: 34745653 PMCID: PMC8570560 DOI: 10.3390/catal11060712] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The catalytic enantioselective ketimine Mannich and its related reactions provide direct access to chiral building blocks bearing an α-tertiary amine stereogenic center, a ubiquitous structural motif in nature. Although ketimines are often viewed as challenging electrophiles, various approaches/strategies to circumvent or overcome the adverse properties of ketimines have been developed for these transformations. This review showcases the selected examples that highlight the benefits and utilities of various ketimines and remaining challenges associated with them in the context of Mannich, allylation, and aza-Morita-Baylis-Hillman reactions as well as their variants.
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Affiliation(s)
- Changgong Xu
- Chemistry Program, Department of Biomedical and Chemical Engineering and Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901-6975, USA
| | - Carlyn Reep
- Chemistry Program, Department of Biomedical and Chemical Engineering and Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901-6975, USA
| | - Jamielyn Jarvis
- Chemistry Program, Department of Biomedical and Chemical Engineering and Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901-6975, USA
| | - Brandon Naumann
- Chemistry Program, Department of Biomedical and Chemical Engineering and Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901-6975, USA
| | - Burjor Captain
- Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, FL 33146-0431, USA
| | - Norito Takenaka
- Chemistry Program, Department of Biomedical and Chemical Engineering and Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901-6975, USA
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12
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Fujita K, Miura M, Funahashi Y, Hatanaka T, Nakamura S. Enantioselective Reaction of 2 H-Azirines with Oxazol-5-(4 H)-ones Catalyzed by Cinchona Alkaloid Sulfonamide Catalysts. Org Lett 2021; 23:2104-2108. [PMID: 33650878 DOI: 10.1021/acs.orglett.1c00259] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The enantioselective reaction of 2H-azirines with oxazol-5-(4H)-ones (oxazolones) using a cinchona alkaloid sulfonamide catalyst has been developed. The reaction proceeded at the C-2 position of oxazolones to afford products with consecutive tetrasubstituted stereogenic centers in high yield with high diastereo- and enantioselectivity. The obtained aziridines were converted into various chiral compounds without loss of enantiopurity.
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Affiliation(s)
- Kazuki Fujita
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | - Masataka Miura
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | - Yasuhiro Funahashi
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Tsubasa Hatanaka
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Shuichi Nakamura
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan.,Frontier Research Institute for Material Science, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
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13
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Bisht GS, Dunchu TD, Gnanaprakasam B. Synthesis of Quaternary Spirooxindole 2H-Azirines under Batch and Continuous Flow Condition and Metal Assisted Umpolung Reactivity for the Ring-Opening Reaction. Chem Asian J 2021; 16:656-665. [PMID: 33464707 DOI: 10.1002/asia.202001418] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Revised: 01/19/2021] [Indexed: 11/06/2022]
Abstract
An efficient and new approach for the synthesis of spirooxindole 2H-azirines via intramolecular oxidative cyclization of 3-(amino(phenyl)methylene)-indolin-2-one derivatives in the presence of I2 and Cs2 CO3 under batch/continuous flow is described. This method is mild and facile to synthesize a variety of spirooxindole 2H-azirines derivatives in gram-scale. Furthermore, we have synthesized spiroaziridine derivatives from spirooxindole 2H-azirines derivatives via addition of Grignard reagent. In addition, we discloses an metal assisted attack of Grignard nucleophile at N-centre rather than C- of the spirooxindole 2H-azirines, which concurrently underwent ring opening of transient aziridines to afford N-substituted Z-3-(aminophenyl)indolin-2-one. A plausible mechanism for azirination and ring-opening reaction is also presented.
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Affiliation(s)
- Girish Singh Bisht
- Department of Chemistry, Indian Institute of Science Education and Research, 411008, Pune, India
| | - Tenzin Dolkar Dunchu
- Department of Chemistry, Indian Institute of Science Education and Research, 411008, Pune, India
| | - Boopathy Gnanaprakasam
- Department of Chemistry, Indian Institute of Science Education and Research, 411008, Pune, India
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14
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Delany EG, Connon SJ. Enantioselective N-heterocyclic carbene-catalysed intermolecular crossed benzoin condensations: improved catalyst design and the role of in situ racemisation. Org Biomol Chem 2021; 19:248-258. [PMID: 33289760 DOI: 10.1039/d0ob02017f] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The enantioselective intermolecular crossed-benzoin condensation mediated by novel chiral N-heterocyclic carbenes derived from pyroglutamic acid has been investigated. A small library of chiral triazolium ions were synthesised. Each possessed a tertiary alcohol H-bond donor and a variable N-aryl substituent. It was found that increasing both the steric requirement and the electron-withdrawing characteristics of the N-aryl ring led to more chemoselective, efficient and enantioselective chemistry, however both quenching the reaction at different times and deuterium incorporation experiments involving the product revealed that this is complicated by product racemisation in situ (except in the case of benzoin itself), which explains the dependence of enantioselectivity on the electrophilicity of the reacting aldehydes common in the literature. Subsequent protocol optimisation, where one reacting partner was an o-substituted benzaldehyde, allowed a range of crossed-benzoins to be synthesised in moderate-good yields with moderate to excellent enantioselectivity.
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Affiliation(s)
- Eoghan G Delany
- Centre for Synthesis and Chemical Biology, Trinity Biomedical Sciences Institute, School of Chemistry, The University of Dublin, Trinity College, Dublin 2, Ireland.
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15
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Yoshida Y, Kukita M, Omori K, Mino T, Sakamoto M. Iminophosphorane-mediated regioselective umpolung alkylation reaction of α-iminoesters. Org Biomol Chem 2021; 19:4551-4564. [DOI: 10.1039/d1ob00596k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first regioselective umpolung alkylation of α-iminoesters with alkyl halides mediated by iminophosphorane has developed (up to 82% yield).
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Affiliation(s)
- Yasushi Yoshida
- Molecular Chirality Research Center
- Graduate School of Engineering
- Chiba University
- Chiba 263-8522
- Japan
| | - Mayu Kukita
- Molecular Chirality Research Center
- Graduate School of Engineering
- Chiba University
- Chiba 263-8522
- Japan
| | - Kazuki Omori
- Molecular Chirality Research Center
- Graduate School of Engineering
- Chiba University
- Chiba 263-8522
- Japan
| | - Takashi Mino
- Molecular Chirality Research Center
- Graduate School of Engineering
- Chiba University
- Chiba 263-8522
- Japan
| | - Masami Sakamoto
- Molecular Chirality Research Center
- Graduate School of Engineering
- Chiba University
- Chiba 263-8522
- Japan
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16
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Trost BM, Zhu C. Zn-ProPhenol Catalyzed Enantioselective Mannich Reaction of 2 H-Azirines with Alkynyl Ketones. Org Lett 2020; 22:9683-9687. [PMID: 33269592 DOI: 10.1021/acs.orglett.0c03737] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The enantioselective Mannich reaction of 2H-azirines with alkynyl ketones is achieved under Zn-ProPhenol catalysis, delivering various aziridines with vicinal tetrasubstituted stereocenters in high yields with excellent enantioselectivities. The bimetallic Zn-ProPhenol complexes activate both the nucleophile and the electrophile in the same chiral pocket. A unique intramolecular hydrogen bond is observed in the obtained Mannich adducts, which lowers the basicity of the product's aziridine nitrogen thus favoring enantioselective control and allowing catalyst turnover.
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| | - Chuanle Zhu
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
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17
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Peng Q, Guo D, Zhang B, Liu L, Wang J. Benzotetramisole catalyzed kinetic resolution of 2H-azirines. Chem Commun (Camb) 2020; 56:12427-12430. [PMID: 32939521 DOI: 10.1039/d0cc05379a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
An unprecedented benzotetramisole (BTM)-catalyzed kinetic resolution for the efficient synthesis of chiral 2H-azirines is described. This protocol provides two chiral isomers in one step with broad scope, good yield and high enantioselectivity. In addition, the optically pure 2H-azirine products have proven to be useful building blocks for further synthetic transformations.
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Affiliation(s)
- Qiupeng Peng
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorous Chemistry & Chemical Biology (Ministry of Education), Tsinghua University, Beijing, 100084, China.
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18
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Du D, Zhang K, Ma R, Chen L, Gao J, Lu T, Shi Z, Feng J. Bio- and Medicinally Compatible α-Amino-Acid Modification via Merging Photoredox and N-Heterocyclic Carbene Catalysis. Org Lett 2020; 22:6370-6375. [DOI: 10.1021/acs.orglett.0c02202] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Ding Du
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Kuili Zhang
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Rui Ma
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Lei Chen
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Jian Gao
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Tao Lu
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Zhihao Shi
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Jie Feng
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
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19
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Das TK, Biju AT. Imines as acceptors and donors in N-heterocyclic carbene (NHC) organocatalysis. Chem Commun (Camb) 2020; 56:8537-8552. [PMID: 32602493 DOI: 10.1039/d0cc03290e] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The synthetic potential of imines as electrophiles or as a source of nucleophilic coupling partner in N-heterocyclic carbene (NHC) catalysis for the synthesis of various nitrogen heterocycles and functionalized amines is highlighted in this Feature Article. Electrophilic imines are suitable candidates for intercepting the NHC-derived acyl anions, homoenolate equivalents, and (di)enolates for the synthesis of α-amino ketones and a variety of lactam derivatives. Moreover, enamines generated from imines bearing α-hydrogen could be trapped with α,β-unsaturated acylazoliums for the synthesis of functionalized dihydropyridinones. NHCs are also useful for the umpolung of imines for the generation of aza-Breslow intermediates thus leading to the synthesis of indoles, quinolines, dihydroquinoxalines etc. A concise account of the diverse reactivity of imines in NHC catalysis has been presented.
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Affiliation(s)
- Tamal Kanti Das
- Organic Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr Homi Bhabha Road, Pune-411008, India and Academy of Scientific and Innovative Research (AcSIR), New Delhi 110020, India
| | - Akkattu T Biju
- Department of Organic Chemistry, Indian Institute of Science, Bangalore-560012, India.
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20
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Zhang B, Peng Q, Guo D, Wang J. NHC-Catalyzed Radical Trifluoromethylation Enabled by Togni Reagent. Org Lett 2020; 22:443-447. [DOI: 10.1021/acs.orglett.9b04203] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bei Zhang
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorous Chemistry & Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China
| | - Qiupeng Peng
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorous Chemistry & Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China
| | - Donghui Guo
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorous Chemistry & Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China
| | - Jian Wang
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorous Chemistry & Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China
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21
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Hu H, Wang C, Lai H, Wang S, Ni H, Yu W, Cao P. The Fe(iii)-catalyzed decarboxylative cycloaddition of β-ketoacids and 2H-azirines for the synthesis of pyrrole derivatives. Org Chem Front 2020. [DOI: 10.1039/d0qo00951b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
An Fe(iii)-catalyzed Mannich/decarboxylative ring expansion reaction to generate pyrrole derivatives has been achieved using Fe(OTf)3 as the catalyst. A series of pyrrole derivatives was obtained in moderate to excellent yields.
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Affiliation(s)
- Haipeng Hu
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610068
- China
| | - Cuilin Wang
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610068
- China
| | - Han Lai
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610068
- China
| | - Siyuan Wang
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610068
- China
| | - Hailiang Ni
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610068
- China
| | - Wenhao Yu
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610068
- China
| | - Peng Cao
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610068
- China
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22
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Jiang D, Wu Z, Wang J. NHC‐catalyzed Redox‐Neutral Aza‐Benzoin Reaction of Aldehydes with Tetrahydroisoquinolines. CHINESE J CHEM 2019. [DOI: 10.1002/cjoc.201900405] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Di Jiang
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorous Chemistry & Chemical Biology (Ministry of Education), Tsinghua University Beijing 100084 China
| | - Zijun Wu
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorous Chemistry & Chemical Biology (Ministry of Education), Tsinghua University Beijing 100084 China
| | - Jian Wang
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorous Chemistry & Chemical Biology (Ministry of Education), Tsinghua University Beijing 100084 China
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23
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Feng L, Yang C, Xia W. Visible-Light Promoted Selective Imination of Unactivated C–H Bonds via Copper-nitrene Intermediates for the Synthesis of 2H-Azirines. Org Lett 2019; 21:8323-8327. [DOI: 10.1021/acs.orglett.9b03103] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Liyan Feng
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| | - Chao Yang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| | - Wujiong Xia
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
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24
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Liu Q, Sun L, Li S, Li X, Qu L, Lan Y, Wei D. Insights into N‐Heterocyclic Carbene (NHC)‐Catalyzed Asymmetric Addition of 2H‐Azirine with Aldehyde. Chem Asian J 2019; 14:2000-2007. [DOI: 10.1002/asia.201900076] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 03/14/2019] [Indexed: 12/15/2022]
Affiliation(s)
- Qiuli Liu
- The College of Chemistry and Molecular EngineeringZhengzhou University No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
| | - Ling Sun
- Basic Teaching DepartmentHuanghe Jiaotong University No. 333 Yingbin Road Wuzhi Henan 454950 P. R. China
| | - Shi‐Jun Li
- The College of Chemistry and Molecular EngineeringZhengzhou University No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
| | - Xue Li
- The College of Chemistry and Molecular EngineeringZhengzhou University No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
| | - Ling‐Bo Qu
- The College of Chemistry and Molecular EngineeringZhengzhou University No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
| | - Yu Lan
- The College of Chemistry and Molecular EngineeringZhengzhou University No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
| | - Donghui Wei
- The College of Chemistry and Molecular EngineeringZhengzhou University No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
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25
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Sakharov PA, Rostovskii NV, Khlebnikov AF, Khoroshilova OV, Novikov MS. Transition Metal‐Catalyzed Synthesis of 3‐Coumaranone‐Containing NH‐Aziridines from 2
H
‐Azirines: Nickel(II) versus Gold(I). Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900366] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Pavel A. Sakharov
- Saint Petersburg State UniversityInstitute of Chemistry 7/9 Universitetskaya nab. St. Petersburg 199034 Russia
| | - Nikolai V. Rostovskii
- Saint Petersburg State UniversityInstitute of Chemistry 7/9 Universitetskaya nab. St. Petersburg 199034 Russia
| | - Alexander F. Khlebnikov
- Saint Petersburg State UniversityInstitute of Chemistry 7/9 Universitetskaya nab. St. Petersburg 199034 Russia
| | - Olesya V. Khoroshilova
- Saint Petersburg State UniversityCenter for X-ray Diffraction Studies, Research Park Universitetskiy pr. 26 St. Petersburg, Petrodvoretz 198504 Russia
| | - Mikhail S. Novikov
- Saint Petersburg State UniversityInstitute of Chemistry 7/9 Universitetskaya nab. St. Petersburg 199034 Russia
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26
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Nakamura S. Enantioselective Reaction of 2H-Azirines. Chem Asian J 2019; 14:1323-1330. [PMID: 30861307 DOI: 10.1002/asia.201900107] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 03/10/2019] [Indexed: 12/12/2022]
Abstract
2H-Azirines are useful precursors for the synthesis of a variety of chiral aziridine and amine derivatives with a range of biological activities. Owing to the ring strain and the presence of a C=N double bond, 2H-azirines are more reactive than other types of ketimine, and undergo a range of enantioselective reactions, including reduction and Diels-Alder reactions, as well as nucleophilic addition to the C=N double bond. Therefore, the enantioselective reactions of 2H-azirines has become a hot topic, in particular within the last few years. In this Minireview, we focus on the enantioselective reactions of 2H-azirines by using catalytic or stoichiometric amounts of chiral additives, the reaction mechanisms, and the applications of these reactions of 2H-azirines and related compounds in organic synthesis.
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Affiliation(s)
- Shuichi Nakamura
- Frontier Research Institute for Material Science, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya, 466-8555, Japan
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27
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Khlebnikov AF, Novikov MS, Rostovskii NV. Advances in 2H-azirine chemistry: A seven-year update. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.03.040] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Zhang HJ, Xie YC, Yin L. Copper(I)-catalyzed asymmetric decarboxylative Mannich reaction enabled by acidic activation of 2H-azirines. Nat Commun 2019; 10:1699. [PMID: 30979892 PMCID: PMC6461707 DOI: 10.1038/s41467-019-09750-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 03/29/2019] [Indexed: 12/26/2022] Open
Abstract
Chiral aziridines are structure units found in many biologically active compounds and are important building blocks in organic synthesis. Herein, by merging nucleophilic generation through copper(I)-catalyzed decarboxylation and activation of poorly electrophilic 2H-azirines through protonation with carboxylic acids, an asymmetric decarboxylative Mannich reaction between α,α-disubstituted cyanoacetic acids and 2H-azirines is uncovered, which leads to generation of chiral aziridines containing vicinal tetrasubstituted and acyclic quaternary stereogenic carbon centers in good to excellent diastereo- and enantioselectivities. At last, transformations of the produced chiral aziridine are successfully carried out to deliver synthetically useful compounds. Due to their poor electrophilicity, 2H-azirines do not easily react with nucleophiles. Here, the authors show an acidic activation of 2H-azirines by cyanoacetic acid coupling partners affording chiral aziridines containing vicinal tetrasubstituted and acyclic quaternary stereogenic carbon centers.
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Affiliation(s)
- Hai-Jun Zhang
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Yan-Cheng Xie
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Liang Yin
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, 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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29
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Singh GS. Advances in synthesis and chemistry of aziridines. ADVANCES IN HETEROCYCLIC CHEMISTRY 2019. [DOI: 10.1016/bs.aihch.2018.12.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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30
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Peng Q, Zhang B, Xie Y, Wang J. Carbene-Catalyzed [4 + 2] Annulation of 2 H-Azirine-2-carboxaldehydes with Ketones via Azolium Aza-Dienolate Intermediate. Org Lett 2018; 20:7641-7644. [PMID: 30479131 DOI: 10.1021/acs.orglett.8b03378] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A new carbene-catalyzed [4 + 2] annulation of 2 H-azirine-2-carbaldehydes with ketones was developed, thus providing the 2,3-dihydro-6 H-1,3-oxazin-6-one core structures with broad scope and good to excellent yields. Notably, the azolium aza-dienolates generated from the addition of NHCs to 2 H-azirines are first uncovered.
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Affiliation(s)
- Qiupeng Peng
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorous Chemistry & Chemical Biology (Ministry of Education) , Tsinghua University , Beijing 100084 , China
| | - Bei Zhang
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorous Chemistry & Chemical Biology (Ministry of Education) , Tsinghua University , Beijing 100084 , China
| | - Yangxi Xie
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorous Chemistry & Chemical Biology (Ministry of Education) , Tsinghua University , Beijing 100084 , China
| | - Jian Wang
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorous Chemistry & Chemical Biology (Ministry of Education) , Tsinghua University , Beijing 100084 , China
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31
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Hu H, Xu J, Liu W, Dong S, Lin L, Feng X. Copper-Catalyzed Asymmetric Addition of Tertiary Carbon Nucleophiles to 2H-Azirines: Access to Chiral Aziridines with Vicinal Tetrasubstituted Stereocenters. Org Lett 2018; 20:5601-5605. [DOI: 10.1021/acs.orglett.8b02274] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Haipeng Hu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Jinxiu Xu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Wen Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Shunxi Dong
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
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32
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Zhu J, Fang S, Sun K, Fang C, Lu T, Du D. N-Heterocyclic Carbene-Catalyzed Formal Conjugate Hydroacylation: An Atom-Economic Synthesis of 1H-Indol-3-yl Esters. J Org Chem 2018; 83:10430-10435. [DOI: 10.1021/acs.joc.8b01488] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Jindong Zhu
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Shuaishuai Fang
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Kewen Sun
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Chao Fang
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Tao Lu
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Ding Du
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
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33
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Yan J, Sun R, Shi K, Li K, Yang L, Zhong G. N-Heterocyclic Carbene-Catalyzed Asymmetric Benzoin Reaction in Water. J Org Chem 2018; 83:7547-7552. [DOI: 10.1021/acs.joc.8b00481] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Jun Yan
- College of Materials, Chemistry & Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China
| | - Rong Sun
- College of Materials, Chemistry & Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China
| | - Kuangxi Shi
- College of Materials, Chemistry & Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China
| | - Kai Li
- College of Materials, Chemistry & Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China
| | - Limin Yang
- College of Materials, Chemistry & Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China
| | - Guofu Zhong
- College of Materials, Chemistry & Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China
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34
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35
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Tian D, Peng H, Liu Z, Tang W. Optically active N-alkyl aziridines via stereospecific reductive cyclization of α-mesylated acetamides. Org Chem Front 2018. [DOI: 10.1039/c8qo00774h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient method for the synthesis of optically active N-alkyl aziridines has been realized for the first time by stereospecific reductive cyclization of optically active α-mesylated acetamides. A series of optically active N-alkyl aziridines are prepared in moderate to good yields and excellent ees.
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Affiliation(s)
- Duanshuai Tian
- State Key Laboratory of Bio-Organic and Natural Products Chemistry
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Shanghai 200032
| | - Henian Peng
- State Key Laboratory of Bio-Organic and Natural Products Chemistry
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Shanghai 200032
| | - Ziyue Liu
- State Key Laboratory of Bio-Organic and Natural Products Chemistry
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Shanghai 200032
| | - Wenjun Tang
- State Key Laboratory of Bio-Organic and Natural Products Chemistry
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Shanghai 200032
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