1
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Duan Y, Zheng Z, Yu Z, Sun S, Lin B, Liu X, Liu P. Catalyst-Free α- trans-Selective Hydroboration and ( E)-Selective Deuterated Semihydrogenation of Alkynyl Sulfones. J Org Chem 2024; 89:8326-8333. [PMID: 38817078 DOI: 10.1021/acs.joc.3c02833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2024]
Abstract
Here, we present a straightforward α-trans-selective hydroboration of alkynyl sulfones with NHC-boranes without the need for a catalyst. This reaction is compatible with a wide range of substrates for efficiently producing structurally diverse α-borylated vinyl sulfones in satisfactory yields. The hydride transfer from NHC-borane 2a to alkynyl triflone 1b is studied by density functional theory (DFT) calculations for trans-hydroboration. Moreover, a regiodivergent deuterated semihydrogenation of alkynyl triflones has also been developed using D2O as the deuterium source. A variety of diversity-oriented D-containing vinyl triflones were prepared in good to excellent yields with excellent deuterium incorporation ratios. Synthetic manipulations of the deuterated products are achieved for the conversion into valuable deuterated molecules, indicating the utility of this protocol.
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Affiliation(s)
- Yunnan Duan
- Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Generic Drug Research Center of Guizhou Province, School of Pharmacy, Zunyi Medical University, Zunyi 563000, China
| | - Zhouqing Zheng
- Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Generic Drug Research Center of Guizhou Province, School of Pharmacy, Zunyi Medical University, Zunyi 563000, China
| | - Zhiwei Yu
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Shitao Sun
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Bin Lin
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Xiaozu Liu
- Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Generic Drug Research Center of Guizhou Province, School of Pharmacy, Zunyi Medical University, Zunyi 563000, China
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi 563000, China
| | - Peijun Liu
- Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Generic Drug Research Center of Guizhou Province, School of Pharmacy, Zunyi Medical University, Zunyi 563000, China
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi 563000, China
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2
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Phang YL, Jin JK, Zhang FL, Wang YF. Radical hydroboration for the synthesis of organoboron compounds. Chem Commun (Camb) 2024; 60:4275-4289. [PMID: 38566567 DOI: 10.1039/d4cc00398e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Organoboron compounds demonstrate diverse applications in the fields of organic synthesis, materials science, and medicinal chemistry. Compared to the conventional hydroboration reaction, radical hydroboration serves as an alternative approach for the synthesis of organoborons via different mechanisms. In radical hydroboration, a boryl radical is initially generated from homolytic cleavage of a B-H or a B-B bond, which is then added to an unsaturated double bond to deliver a carbon radical. Subsequent hydrogen atom transfer or reduction of the carbon radical to form a carbanion followed by protonation gave the final product. Over the past few years, numerous efforts have been made for efficient synthesis of boryl radicals and the expansion of substrate scope of the radical hydroboration reaction. Here, we discuss the recent advancement of radical hydroboration and its associated mechanisms. Numerous radical hydroboration strategies employing N-heterocyclic carbene borane, bis(pinacolato)diboron and pinacolborane as the boron source were illustrated. Thermochemical, photochemical and electrochemical strategies for the generation of boryl radicals were also discussed in detail.
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Affiliation(s)
- Yee Lin Phang
- Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China.
| | - Ji-Kang Jin
- Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China.
| | - Feng-Lian Zhang
- Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China.
| | - Yi-Feng Wang
- Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China.
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3
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Komaki T, Sato Y, Uchiyama M, Tanaka K, Nagashima Y. Visible-Light-Induced trans-Hydroboration of Diaryl Alkynes Utilizing Excited State of Borate Complexes. Org Lett 2024; 26:2180-2185. [PMID: 38466232 DOI: 10.1021/acs.orglett.4c00268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
We have developed visible-light-induced trans-hydroboration of diaryl alkynes via direct photoexcitation of in-situ-generated diboron complexes, affording previously elusive (E)-1,2-diaryl-vinylboronates with high stereoselectivity. Experimental, spectroscopic, and theoretical mechanistic studies revealed that the triplet-state borate complex facilitates B-B bond cleavage and the desired C-B bond formation. This methodology does not require any catalyst and is operationally simple. The highly borylated 1,2-diaryl alkenes [1-(2-borylphenyl)vinyl)boronates] are shown to be useful as building blocks.
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Affiliation(s)
- Takahiro Komaki
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Yu Sato
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Masanobu Uchiyama
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Ken Tanaka
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Yuki Nagashima
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8550, Japan
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4
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Chen Z, Nie B, Li X, Liu T, Li C, Huang J. Ligand-controlled regiodivergent Ni-catalyzed trans-hydroboration/carboboration of internal alkynes with B 2pin 2. Chem Sci 2024; 15:2236-2242. [PMID: 38332812 PMCID: PMC10848681 DOI: 10.1039/d3sc04184k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 01/04/2024] [Indexed: 02/10/2024] Open
Abstract
Unprecedented regioselective trans-hydroboration and carboboration of unbiased electronically internal alkynes were realized via a nickel catalysis system with the aid of the directing group strategy. Furthermore, the excellent α- and β-regioselectivity could be accurately switched by the nitrogen ligand (terpy) and phosphine ligand (Xantphos). Mechanistic studies provided an insight into the rational reaction process, that underwent the cis-to-trans isomerization of alkenyl nickel species. This transformation not only expands the scope of transition-metal-catalyzed boration of internal alkynes but also, more particularly, portrays the vast prospects of the directing group strategy in the selective functionalization of unactivated alkynes.
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Affiliation(s)
- Zunsheng Chen
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases (Gannan Medical University), Ministry of Education, School of Pharmacy, Gannan Medical University Ganzhou 341000 P. R. China
| | - Biao Nie
- State Key Laboratory of Anti-Infective Drug Development, Sunshine Lake Pharma Company, Ltd Dongguan 523871 P. R. China
| | - Xiaoning Li
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases (Gannan Medical University), Ministry of Education, School of Pharmacy, Gannan Medical University Ganzhou 341000 P. R. China
| | - Teng Liu
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases (Gannan Medical University), Ministry of Education, School of Pharmacy, Gannan Medical University Ganzhou 341000 P. R. China
| | - Chunsheng Li
- School of Chemistry and Chemical Engineering, Zhaoqing University Zhaoqing 526060 P. R. China
| | - Jiuzhong Huang
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases (Gannan Medical University), Ministry of Education, School of Pharmacy, Gannan Medical University Ganzhou 341000 P. R. China
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5
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Xie Y, Zhang R, Chen Z, Rong M, He H, Ni S, He X, Xiao W, Xuan J. Photocatalytic Boryl Radicals Triggered Sequential B─N/C─N Bond Formation to Assemble Boron-Handled Pyrazoles. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2306728. [PMID: 38018506 PMCID: PMC10797447 DOI: 10.1002/advs.202306728] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 10/26/2023] [Indexed: 11/30/2023]
Abstract
Vinyldiazo compounds are one of the most important synthons in the construction of a cyclic ring. Most photochemical transformations of vinyldiazo compounds are mainly focusing on utilization of their C═C bond site, while reactions taking place at terminal nitrogen atom are largely unexplored. Herein, a photocatalytic cascade radical cyclization of LBRs with vinyldiazo reagents through sequential B─N/C─N bond formation is described. The reaction starts with the addition of LBRs (Lewis base-boryl radicals) at diazo site, followed by intramolecular radical cyclization to access a wide range of important boron-handled pyrazoles in good to excellent yields. Control experiments, together with detailed mechanism studies well explain the observed reactivity. Further studies demonstrate the utility of this approach for applications in pharmaceutical and agrochemical research.
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Affiliation(s)
- Yang Xie
- Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials and Key Laboratory of Functional Inorganic Materials of Anhui ProvinceCollege of Chemistry & Chemical EngineeringAnhui UniversityHefeiAnhui230601P. R. China
| | - Ruilong Zhang
- Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials and Key Laboratory of Functional Inorganic Materials of Anhui ProvinceCollege of Chemistry & Chemical EngineeringAnhui UniversityHefeiAnhui230601P. R. China
| | - Ze‐Le Chen
- Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials and Key Laboratory of Functional Inorganic Materials of Anhui ProvinceCollege of Chemistry & Chemical EngineeringAnhui UniversityHefeiAnhui230601P. R. China
| | - Mengtao Rong
- Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials and Key Laboratory of Functional Inorganic Materials of Anhui ProvinceCollege of Chemistry & Chemical EngineeringAnhui UniversityHefeiAnhui230601P. R. China
| | - Hui He
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong ProvinceShantou UniversityShantouGuangdong515063P. R. China
| | - Shaofei Ni
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong ProvinceShantou UniversityShantouGuangdong515063P. R. China
| | - Xiang‐Kui He
- Key Laboratory of Pesticide and Chemical BiologyMinistry of EducationCollege of ChemistryCentral China Normal UniversityWuhanHubei430079P. R. China
| | - Wen‐Jing Xiao
- Key Laboratory of Pesticide and Chemical BiologyMinistry of EducationCollege of ChemistryCentral China Normal UniversityWuhanHubei430079P. R. China
| | - Jun Xuan
- Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials and Key Laboratory of Functional Inorganic Materials of Anhui ProvinceCollege of Chemistry & Chemical EngineeringAnhui UniversityHefeiAnhui230601P. R. China
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6
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Lou X, Lin J, Kwok CY, Lyu H. Stereoselective Unsymmetrical 1,1-Diborylation of Alkynes with a Neutral sp 2 -sp 3 Diboron Reagent. Angew Chem Int Ed Engl 2023; 62:e202312633. [PMID: 37822069 DOI: 10.1002/anie.202312633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 10/11/2023] [Accepted: 10/11/2023] [Indexed: 10/13/2023]
Abstract
The incorporation of two distinct boryl groups at the same carbon center in organic molecules has attracted growing research interest due to its potential for facilitating controlled, precise synthesis through stepwise dual carbon-boron bond transformations. Here we report a method to access unsymmetrical 1,1-diborylalkene (UDBA) stereoselectively via the reaction of readily available alkynes with a neutral sp2 -sp3 diboron reagent (NHC)BH2 -Bpin (NHC=N-heterocyclic carbene). Attributing to the chemically easily distinguishable nature of the sp2 and sp3 boryl moieties, controllable stepwise derivatization of the resultant UDBAs is realized. This process leads to various multifunctionalized olefins and organoborons, such as acylboranes, which are difficult to prepare by other methods.
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Affiliation(s)
- Xiangyu Lou
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China
| | - Jiaxin Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Chun Yin Kwok
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China
| | - Hairong Lyu
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China
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7
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Biremond T, Riomet M, Jubault P, Poisson T. Photocatalytic and Electrochemical Borylation and Silylation Reactions. CHEM REC 2023; 23:e202300172. [PMID: 37358334 DOI: 10.1002/tcr.202300172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 06/05/2023] [Indexed: 06/27/2023]
Abstract
Due to their high versatility borylated and silylated compounds are inevitable synthons for organic chemists. To escape the classical hydroboration/hydrosilylation paradigm, chemists turned their attention to more modern and green methods such as photoredox chemistry and electrosynthesis. This account focuses on novel methods for the generation of boryl and silyl radicals to forge C-B and C-Si bonds from our group.
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Affiliation(s)
- Tony Biremond
- Normandie Univ., INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), 76000, Rouen, France
| | - Margaux Riomet
- Normandie Univ., INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), 76000, Rouen, France
| | - Philippe Jubault
- Normandie Univ., INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), 76000, Rouen, France
| | - Thomas Poisson
- Normandie Univ., INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), 76000, Rouen, France
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8
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Xie F, Mao Z, Curran DP, Liang H, Dai W. Facile Borylation of Alkenes, Alkynes, Imines, Arenes and Heteroarenes with N-Heterocyclic Carbene-Boranes and a Heterogeneous Semiconductor Photocatalyst. Angew Chem Int Ed Engl 2023; 62:e202306846. [PMID: 37555790 DOI: 10.1002/anie.202306846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 08/08/2023] [Accepted: 08/09/2023] [Indexed: 08/10/2023]
Abstract
Although the development of radical chain and photocatalytic borylation reactions using N-heterocyclic carbene (NHC)-borane as boron source is remarkable, the persistent problems, including the use of hazardous and high-energy radical initiators or the recyclability and photostability issues of soluble homogeneous photocatalysts, still leave great room for further development in a sustainable manner. Herein, we report a conceptually different approach toward highly functionalized organoborane synthesis by using recoverable ultrathin cadmium sulfide (CdS) nanosheets as a heterogeneous photocatalyst, and a general and mild borylation platform that enables regioselective borylation of a wide variety of alkenes (arylethenes, trifluoromethylalkenes, α,β-unsaturated carbonyl compounds and nitriles), alkynes, imines and electron-poor aromatic rings with NHC-borane as boryl radical precursor. Mechanistic studies and density functional theory (DFT) calculations reveal that both photogenerated electrons and holes on the CdS fully perform their own roles, thereby resulting in enhancement of photocatalytic activity and stability of CdS.
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Affiliation(s)
- Fukai Xie
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
| | - Zhan Mao
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
| | - Dennis P Curran
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15208, USA
| | - Hongliang Liang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
| | - Wen Dai
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
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9
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Tian X, Zhang YK, You YX, Han JR, Cheng QS, Fan SM, Chen DD, Wang TT, Liu S, Su W. LiO tBu-Promoted trans-Stereoselective and β-Regioselective Hydroboration of Propargyl Alcohols. Org Lett 2023; 25:6401-6406. [PMID: 37603790 DOI: 10.1021/acs.orglett.3c02411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Abstract
A convenient and efficient trans-stereoselective and β-regioselective hydroboration of propargyl alcohols was achieved simply with LiOtBu as the base and (Bpin)2 as the boron reagent in dimethyl sulfoxide at room temperature. Both terminal and internal propargyl alcohols with diverse structures and functional groups underwent the transformation smoothly to produce β-Bpin-substituted (E)-allylic alcohols, of which the synthetic potentials were demonstrated by the downstream conversions of boronate, alkenyl, and hydroxyl groups.
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Affiliation(s)
- Xia Tian
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Yu-Kun Zhang
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Ya-Xin You
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Jian-Rong Han
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Qiu-Shi Cheng
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
- Hebei Provincial Key Laboratory of Photoelectric Control on Surface and Interface, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Shi-Ming Fan
- Hebei Key Laboratory of Molecular Chemistry for Drug, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Di-Di Chen
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Ting-Ting Wang
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Shouxin Liu
- Hebei Key Laboratory of Molecular Chemistry for Drug, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Wei Su
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
- Hebei Key Laboratory of Molecular Chemistry for Drug, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
- Hebei Provincial Key Laboratory of Photoelectric Control on Surface and Interface, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
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10
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Li FX, Wang X, Lin J, Lou X, Ouyang J, Hu G, Quan Y. Selective multifunctionalization of N-heterocyclic carbene boranes via the intermediacy of boron-centered radicals. Chem Sci 2023; 14:6341-6347. [PMID: 37325159 PMCID: PMC10266453 DOI: 10.1039/d3sc01132a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 05/17/2023] [Indexed: 06/17/2023] Open
Abstract
The selective difunctionalization of N-heterocyclic carbene (NHC) boranes with alkenes has been achieved via decatungstate and thiol synergistic catalysis. The catalytic system also allows stepwise trifunctionalization, leading to complex NHC boranes with three different functional groups which are challenging to prepare by other methods. The strong hydrogen-abstracting ability of the excited decatungstate enables the generation of boryl radicals from mono- and di-substituted boranes for realizing borane multifunctionalization. This proof-of-principle research provides a new chance for fabricating unsymmetrical boranes and developing boron-atom-economic synthesis.
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Affiliation(s)
- Feng-Xing Li
- Department of Chemistry, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong SAR China
| | - Xinmou Wang
- Department of Chemistry, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong SAR China
| | - Jiaxin Lin
- Department of Chemistry, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong SAR China
| | - Xiangyu Lou
- Department of Chemistry, The Chinese University of Hong Kong Shatin, N.T. Hong Kong SAR China
| | - Jing Ouyang
- Department of Chemistry, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong SAR China
| | - Guanwen Hu
- Department of Chemistry, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong SAR China
| | - Yangjian Quan
- Department of Chemistry, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong SAR China
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11
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Fürstner A. How to Break the Law:
trans
‐Hydroboration and
gem
‐Hydroboration of Alkynes. Isr J Chem 2023. [DOI: 10.1002/ijch.202300004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
Affiliation(s)
- Alois Fürstner
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
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12
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Wang Z, Chen J, Lin Z, Quan Y. Photoinduced Dehydrogenative Borylation via Dihydrogen Bond Bridged Electron Donor and Acceptor Complexes. Chemistry 2023; 29:e202203053. [PMID: 36396602 DOI: 10.1002/chem.202203053] [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: 09/30/2022] [Revised: 11/17/2022] [Accepted: 11/17/2022] [Indexed: 11/19/2022]
Abstract
Air-stable amine- and phosphine-boranes are discovered as donors to integrate with pyridinium acceptor for generating photoactive electron-donor-acceptor (EDA) complexes. Experimental results and DFT calculations suggest a dihydrogen bond bridging the donor and acceptor. Irradiating the EDA complex enables an intra-complex single electron transfer to give a boron-centered radical for dehydrogenative borylation with no need of external photosensitizer and radical initiator. The deprotonation of Wheland-like radical intermediate rather than its generation is believed to determine the good ortho-selectivity based on DFT calculations. A variety of α-borylated pyridine derivatives have been readily synthesized with good functional group tolerance.
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Affiliation(s)
- Zhiyong Wang
- Department of Chemistry, The Hong Kong University of Science and Technology Clear Water Bay, Kowloon, Hong Kong SAR, P. R. China
| | - Jiaxin Chen
- Department of Chemistry, The Hong Kong University of Science and Technology Clear Water Bay, Kowloon, Hong Kong SAR, P. R. China
| | - Zhenyang Lin
- Department of Chemistry, The Hong Kong University of Science and Technology Clear Water Bay, Kowloon, Hong Kong SAR, P. R. China
| | - Yangjian Quan
- Department of Chemistry, The Hong Kong University of Science and Technology Clear Water Bay, Kowloon, Hong Kong SAR, P. R. China
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13
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Peng TY, Zhang FL, Wang YF. Lewis Base-Boryl Radicals Enabled Borylation Reactions and Selective Activation of Carbon-Heteroatom Bonds. Acc Chem Res 2023; 56:169-186. [PMID: 36571794 DOI: 10.1021/acs.accounts.2c00752] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
ConspectusThe past decades have witnessed tremendous progress on radical reactions. However, in comparison with carbon, nitrogen, oxygen, and other main group element centered radicals, the synthetic chemistry of boron centered radicals was less studied, mainly due to the high electron-deficiency and instability of such 3-center-5-electron species. In the 1980s, Roberts and co-workers found that the coordination of a Lewis base (amines or phosphines) with the boron center could form 4-center-7-electron boryl radicals (Lewis base-boryl radicals, LBRs) that are found to be more stable. However, only limited synthetic applications were developed. In 2008, Curran and co-workers achieved a breakthrough with the discovery of N-heterocyclic carbene (NHC) boryl radicals, which could enable a range of radical reduction and polymerization reactions. Despite these exciting findings, more powerful and valuable synthetic applications of LBRs would be expected, given that the structures and reactivities of LBRs could be easily modulated, which would provide ample opportunities to discover new reactions. In this Account, a summary of our key contributions in LBR-enabled radical borylation reactions and selective activation of inert carbon-heteroatom bonds will be presented.Organoboron compounds have shown versatile applications in chemical society, and their syntheses rely principally on ionic borylation reactions. The development of mechanistically different radical borylation reactions allows synthesizing products that are inaccessible by traditional methods. For this purpose, we progressively developed a series of NHC-boryl radical mediated chemo-, regio-, and stereoselective radical borylation reactions of alkenes and alkynes, by which a wide variety of structurally diverse organoboron molecules were successfully prepared. The synthetic utility of these borylated products was also demonstrated. Furthermore, we disclosed a photoredox protocol for oxidative generation of NHC-boryl radicals, which enabled useful defluoroborylation and arylboration reactions.Selective bond activation is an ideal way to convert simple starting materials to value-added products, while the cleavage of inert chemical bonds, in particular the chemoselectivity control when multiple identical bonds are present in similar chemical environments, remains a long-standing challenge. We envisaged that finely tuning the properties of LBRs might provide a new solution to address this challenge. Recently, we disclosed a 4-dimethylaminopyridine (DMAP)-boryl radical promoted sequential C-F bond functionalization of trifluoroacetic acid derivatives, in which the α-C-F bonds were selectively snipped via a spin-center shift mechanism. This strategy enables facile conversion of abundantly available trifluoroacetic acid to highly valuable mono- and difluorinated molecules. Encouraged by this finding, we further developed a boryl radical enabled three-step sequence to construct all-carbon quaternary centers from a range of trichloromethyl groups, where the three C-Cl bonds were selectively cleaved by the rational choice of suitable boryl radical precursors in each step. Furthermore, a boryl radical promoted dehydroxylative alkylation of α-hydroxy carboxylic acid derivatives was achieved, allowing for the efficient conversion of some biomass platform molecules to high value products.
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Affiliation(s)
- Tian-Yu Peng
- Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, 230026 Anhui, China
| | - Feng-Lian Zhang
- Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, 230026 Anhui, China
| | - Yi-Feng Wang
- Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, 230026 Anhui, China.,State Key Laboratory of Elemento-Organic Chemistry, Nankai University, 94 Weijin Road, Tianjin 300071, China
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14
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Li DC, Zeng JH, Yang YH, Zhan ZP. Transition metal-free radical trans-hydroboration of alkynes with NHC-boranes via visible-light photoredox catalysis. Org Chem Front 2023. [DOI: 10.1039/d3qo00135k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
Abstract
Visible-light-induced 4-CzIPN-catalyzed trans-hydroboration of alkynes with NHC-boranes to generate diverse (E)-alkenylboranes with high selectivity.
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15
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Wang K, Yu Q, Mao W, Zheng Y, Xu J, Wang Y. Copper-catalyzed radical trans-selective hydroboration of ynamides with N-heterocyclic carbene boranes. iScience 2022; 25:104977. [PMID: 36065185 PMCID: PMC9440302 DOI: 10.1016/j.isci.2022.104977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 08/05/2022] [Accepted: 08/15/2022] [Indexed: 11/16/2022] Open
Abstract
Vinylboron compounds are important compounds in organic chemistry and biology. In this communication, we developed a copper(I)-catalyzed, highly regio- and stereoselective radical trans-hydroboration of ynamides with N-heterocyclic carbene (NHC)-ligated borane is reported, which leads to a series of trans-boryl enmides that can be conveniently transformed into various multi-substituted enamides. Further investigation showcased that our method is robust and scalable. The mechanism of this unique reaction is studied and discussed. A Cu-catalyzed highly regio- and stereoselective radical trans-hydroboration of ynamides Good to excellent yields, good functional group tolerance Further investigation showcased that our method is robust and scalable
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Affiliation(s)
- Kefeng Wang
- Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen 518055, China
| | - Qingzhen Yu
- Clinical Medical Research Center, Southern University of Science and Technology Hospital, Shenzhen 518055, China
| | - Wenli Mao
- Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yuxin Zheng
- Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jing Xu
- Department of Chemistry and Shenzhen Grubbs Institute and Guangdong Provincial Key Laboratory of Catalysis and Shenzhen Key Laboratory of Small Molecule Drug Discovery and Synthesis, Southern University of Science and Technology, Shenzhen 518055, China
- Corresponding author
| | - Yukun Wang
- Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen 518055, China
- Department of Pharmacy, Southern University of Science and Technology Hospital, Shenzhen 518055, China
- Corresponding author
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16
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Zhang Y, Liao Y, Liu P, Ran Y, Liu X. Radical borylation of vinyl azides with NHC-boranes: divergent synthesis of α-boryl ketones and borylated triazoles. Org Biomol Chem 2022; 20:3550-3557. [PMID: 35411904 DOI: 10.1039/d2ob00076h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A divergent radical borylation of vinyl azides with N-heterocyclic carbene (NHC) boranes in the presence of tBuSH is described. The protocol enables the divergent synthesis of α-boryl ketones and borylated triazoles with excellent functional group tolerance and a broad substrate scope. Remarkably, this work shows that vinyl azides can serve as unprecedented five-atom synthons for the construction of 1,2,3-triazoles without N2 extrusion.
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Affiliation(s)
- Yifei Zhang
- Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Generic Drug Research Center of Guizhou Province, School of Pharmacy, Zunyi Medical University, Zunyi 563000, China.
| | - Yangzhen Liao
- Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Generic Drug Research Center of Guizhou Province, School of Pharmacy, Zunyi Medical University, Zunyi 563000, China.
| | - Peijun Liu
- Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Generic Drug Research Center of Guizhou Province, School of Pharmacy, Zunyi Medical University, Zunyi 563000, China. .,Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi 563000, China
| | - Yu Ran
- Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Generic Drug Research Center of Guizhou Province, School of Pharmacy, Zunyi Medical University, Zunyi 563000, China.
| | - Xiaozu Liu
- Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Generic Drug Research Center of Guizhou Province, School of Pharmacy, Zunyi Medical University, Zunyi 563000, China. .,Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi 563000, China
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17
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Zhang G, Zeng H, Zheng S, Neary MC, Dub PA. Vanadium-Catalyzed Stereo- and Regioselective Hydroboration of Alkynes to Vinyl Boronates. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01318] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Guoqi Zhang
- Department of Sciences, John Jay College and PhD in Chemistry Program, The Graduate Center of City University of New York, New York, New York 10019, United States
| | - Haisu Zeng
- Department of Sciences, John Jay College and PhD in Chemistry Program, The Graduate Center of City University of New York, New York, New York 10019, United States
- Department of Chemistry, Hunter College, City University of New York, New York, New York 10065, United States
| | - Shengping Zheng
- Department of Chemistry, Hunter College, City University of New York, New York, New York 10065, United States
| | - Michelle C. Neary
- Department of Chemistry, Hunter College, City University of New York, New York, New York 10065, United States
| | - Pavel A. Dub
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
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18
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Taniguchi T. Substituent Effects of Tetracoordinate Boron in Organic Synthesis. Chemistry 2022; 28:e202104333. [DOI: 10.1002/chem.202104333] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Indexed: 12/15/2022]
Affiliation(s)
- Tsuyoshi Taniguchi
- Graduate School of Natural Science and Technology Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
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19
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Ye T, Zhang FL, Xia HM, Zhou X, Yu ZX, Wang YF. Stereoselective hydrogen atom transfer to acyclic radicals: a switch enabling diastereodivergent borylative radical cascades. Nat Commun 2022; 13:426. [PMID: 35058459 PMCID: PMC8776760 DOI: 10.1038/s41467-022-28071-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 01/04/2022] [Indexed: 12/18/2022] Open
Abstract
Radical cascade reactions are powerful tools to construct structurally complex molecules. However, the stereochemical control of acyclic radical intermediates remains a persistent challenge, due to the low differentiation between the two faces of these species. This hurdle further makes stereodivergent synthesis rather more difficult to be accomplished, in particular for intermediates resulted from complex cascades. Here we report an efficient strategy for stereoselective hydrogen atom transfer (HAT) to acyclic carbon radicals, which are generated via N-heterocyclic carbene (NHC)-boryl radicals triggered addition-translocation-cyclization cascades. A synergistic control by the NHC subunit and a thiol catalyst has proved effective for one facial HAT, while a ZnI2-chelation protocol allows for the preferential reaction to the opposite face. Such a stereoselectivity switch enables diastereodivergent construction of heterocycles tethering a boron-substituted stereocenter. Mechanistic studies suggest two complementary ways to tune HAT diastereoselectivity. The stereospecific conversions of the resulting boron-handled products to diverse functionalized molecules are demonstrated.
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Affiliation(s)
- Tian Ye
- Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, 230026, Hefei, Anhui, China
| | - Feng-Lian Zhang
- Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, 230026, Hefei, Anhui, China
| | - Hui-Min Xia
- Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, 230026, Hefei, Anhui, China
| | - Xi Zhou
- Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, 230026, Hefei, Anhui, China
| | - Zhi-Xiang Yu
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, 100871, Beijing, China.
| | - Yi-Feng Wang
- Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, 230026, Hefei, Anhui, China.
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, 300071, Tianjin, China.
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20
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Abstract
Metal-catalyzed hydrofunctionalization reactions of alkynes, i.e., the addition of Y–H units (Y = heteroatom or carbon) across the carbon–carbon triple bond, have attracted enormous attention for decades since they allow the straightforward and atom-economic access to a wide variety of functionalized olefins and, in its intramolecular version, to relevant heterocyclic and carbocyclic compounds. Despite conjugated 1,3-diynes being considered key building blocks in synthetic organic chemistry, this particular class of alkynes has been much less employed in hydrofunctionalization reactions when compared to terminal or internal monoynes. The presence of two C≡C bonds in conjugated 1,3-diynes adds to the classical regio- and stereocontrol issues associated with the alkyne hydrofunctionalization processes’ other problems, such as the possibility to undergo 1,2-, 3,4-, or 1,4-monoadditions as well as double addition reactions, thus increasing the number of potential products that can be formed. In this review article, metal-catalyzed hydrofunctionalization reactions of these challenging substrates are comprehensively discussed.
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21
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Wang J, Zhou H, Wei J, Liu F, Wang T. Metal-free trans-hydroboration without a B-H bond: reactions of propargyl amines with Lewis acidic boranes. Chem Commun (Camb) 2022; 58:6910-6913. [DOI: 10.1039/d2cc02687b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first alkyne trans-hydroboration reaction without a B-H bond was described. This was achieved by reactions of propargyl amines with Lewis acidic boranes under mild conditions. The mechanism involved borane-mediated...
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22
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Zheng H, Xiong H, Su C, Cao H, Yao H, Liu X. Photoinduced successive oxidative ring-opening and borylation of indolizines with NHC–boranes. RSC Adv 2022; 12:470-474. [PMID: 35424515 PMCID: PMC8978647 DOI: 10.1039/d1ra08072e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 12/14/2021] [Indexed: 11/21/2022] Open
Abstract
A facile photoinduced successive oxidative ring-opening and borylation of indolizines with NHC–boranes via a one-pot method has been unveiled. This photo-promoted strategy enables the formation of unsaturated NHC–boryl carboxylates under transition metal-free and radical initiator-free conditions. A wide array of pyridine-containing NHC–boryl carboxylates were directly prepared in moderate to good yields. This work contributes to a better understanding of the reactivity and photo-behavior of both indolizines and NHC–boranes. A facile photoinduced successive oxidative ring-opening and borylation of indolizines with NHC–boranes via a one-pot method has been unveiled. This photo-promoted strategy enables the formation of unsaturated NHC–boryl carboxylates under transition metal-free conditions.![]()
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Affiliation(s)
- Huitao Zheng
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan 528458, China
| | - Honggang Xiong
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan 528458, China
| | - Chaobo Su
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan 528458, China
| | - Hua Cao
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan 528458, China
| | - Huagang Yao
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan 528458, China
| | - Xiang Liu
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan 528458, China
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23
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Abstract
Boron-centred radicals (boryl radicals) are potential and attractive species in main group chemistry and synthetic chemistry. Recently, the development of boron compounds ligated by N-heterocyclic carbenes (NHCs) has sparked off advavnces in boryl radical chemistry because NHCs can highly stabilise boryl radicals by electronic and steric factors. This review highlights recent synthesis and reactions of such NHC-boryl radicals. From the standpoint of main group chemistry, examples of isolation or detection of unique NHC-boryl radicals are presented. From the standpoint of synthetic chemistry, on the other hand, the development of reactions of user-friendly NHC-boryl radicals, which has contributed to radical chemistry, organoboron chemistry and polymer science, is comprehensively described.
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Affiliation(s)
- Tsuyoshi Taniguchi
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
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24
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Li N, Yang S, Huang Z, Pan X. Radical Reduction of Polymer Chain-End Functionality by Stoichiometric N-Heterocyclic Carbene Boranes. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00996] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ning Li
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China
| | - Shicheng Yang
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China
| | - Zhujun Huang
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China
| | - Xiangcheng Pan
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China
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25
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Sustainable hydration of alkynes promoted by first row transition metal complexes. Background, highlights and perspectives. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120288] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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26
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Zhong M, Gagné Y, Hope TO, Pannecoucke X, Frenette M, Jubault P, Poisson T. Copper-Photocatalyzed Hydroboration of Alkynes and Alkenes. Angew Chem Int Ed Engl 2021; 60:14498-14503. [PMID: 33780588 PMCID: PMC8252632 DOI: 10.1002/anie.202101874] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 03/27/2021] [Indexed: 11/23/2022]
Abstract
The photocatalytic hydroboration of alkenes and alkynes is reported. The use of newly-designed copper photocatalysts with B2 Pin2 permits the formation a boryl radical, which is used for hydroboration of a large panel of alkenes and alkynes. The hydroborated products were isolated in high yields, with excellent diastereoselectivities and a high functional group tolerance under mild conditions. The hydroboration reactions were developed under continuous flow conditions to demonstrate their synthetic utility. The reaction mechanism was studied and suggested an oxidation reaction between an in situ formed borate and the Cu-photocatalyst in its excited state for the boryl radical formation.
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Affiliation(s)
- Mingbing Zhong
- Normandie Univ.INSA RouenUNIROUENCNRSCOBRA (UMR 6014)76000RouenFrance
| | - Yohann Gagné
- Département de ChimieUniversité du Québec à MontréalCase postal 8888, Succursale Centre-VilleMontréalQuébecH3C 3P8Canada
| | - Taylor O. Hope
- Département de ChimieUniversité du Québec à MontréalCase postal 8888, Succursale Centre-VilleMontréalQuébecH3C 3P8Canada
| | | | - Mathieu Frenette
- Département de ChimieUniversité du Québec à MontréalCase postal 8888, Succursale Centre-VilleMontréalQuébecH3C 3P8Canada
| | - Philippe Jubault
- Normandie Univ.INSA RouenUNIROUENCNRSCOBRA (UMR 6014)76000RouenFrance
| | - Thomas Poisson
- Normandie Univ.INSA RouenUNIROUENCNRSCOBRA (UMR 6014)76000RouenFrance
- Institut Universitaire de France1 rue Descartes75231ParisFrance
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27
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Zhong M, Gagné Y, Hope TO, Pannecoucke X, Frenette M, Jubault P, Poisson T. Copper‐Photocatalyzed Hydroboration of Alkynes and Alkenes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202101874] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Mingbing Zhong
- Normandie Univ. INSA Rouen UNIROUEN CNRS COBRA (UMR 6014) 76000 Rouen France
| | - Yohann Gagné
- Département de Chimie Université du Québec à Montréal Case postal 8888, Succursale Centre-Ville Montréal Québec H3C 3P8 Canada
| | - Taylor O. Hope
- Département de Chimie Université du Québec à Montréal Case postal 8888, Succursale Centre-Ville Montréal Québec H3C 3P8 Canada
| | - Xavier Pannecoucke
- Normandie Univ. INSA Rouen UNIROUEN CNRS COBRA (UMR 6014) 76000 Rouen France
| | - Mathieu Frenette
- Département de Chimie Université du Québec à Montréal Case postal 8888, Succursale Centre-Ville Montréal Québec H3C 3P8 Canada
| | - Philippe Jubault
- Normandie Univ. INSA Rouen UNIROUEN CNRS COBRA (UMR 6014) 76000 Rouen France
| | - Thomas Poisson
- Normandie Univ. INSA Rouen UNIROUEN CNRS COBRA (UMR 6014) 76000 Rouen France
- Institut Universitaire de France 1 rue Descartes 75231 Paris France
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28
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de la Vega-Hernández K, Chemla F, Ferreira F, Jackowski O, Perez-Luna A. Radical Germylzincation of Aryl- and Alkyl-Substituted Internal Alkynes. Org Lett 2021; 23:4426-4430. [PMID: 34032457 DOI: 10.1021/acs.orglett.1c01367] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The stereoselective germylzincation of internal alkynes delivering trisubstituted vinylgermanes is achieved via a radical chain process involving Ph3GeH and Et2Zn with AIBN as the initiator. Excellent levels of regiocontrol are observed for nonsymmetric (aryl, alkyl)-substituted alkynes and for propargylic alcohols with aryl-, alkyl-, or silyl-substituted alkynes. The germylzincation reaction can be combined in one pot with the Cu(I)-mediated electrophilic substitution of the C(sp2)-Zn bond to obtain synthetically challenging tetrasubstituted vinylgermanes.
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Affiliation(s)
| | - Fabrice Chemla
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
| | - Franck Ferreira
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
| | - Olivier Jackowski
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
| | - Alejandro Perez-Luna
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
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29
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Aelterman M, Sayes M, Jubault P, Poisson T. Electrochemical Hydroboration of Alkynes. Chemistry 2021; 27:8277-8282. [PMID: 33945175 PMCID: PMC8251609 DOI: 10.1002/chem.202101132] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Indexed: 12/21/2022]
Abstract
Herein we reported the electrochemical hydroboration of alkynes by using B2Pin2 as the boron source. This unprecedented reaction manifold was applied to a broad range of alkynes, giving the hydroboration products in good to excellent yields without the need of a metal catalyst or a hydride source. This transformation relied on the possible electrochemical oxidation of an in situ formed borate. This anodic oxidation performed in an undivided cell allowed the formation of a putative boryl radical, which reacted on the alkyne.
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Affiliation(s)
- Maude Aelterman
- Normandie Université, INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), 76000, Rouen, France
| | - Morgane Sayes
- Centre in Green Chemistry and Catalysis, Faculty of Arts and Sciences, Department of Chemistry, Université de Montréal, P.O. Box 6128, Station Downtown, Montréal, Québec, H3 C3 J7, Canada
| | - Philippe Jubault
- Normandie Université, INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), 76000, Rouen, France
| | - Thomas Poisson
- Normandie Université, INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), 76000, Rouen, France.,Institut Universitaire de France, 1 rue Descartes, 75231, Paris, France
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30
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Wang Q, Meng W, Feng X, Du H. B(
C
6
F
5
)
3
‐Catalyzed
Hydroboration of Alkenes with
N
‐Heterocyclic
Carbene Boranes
via
B—H Bond Activation. CHINESE J CHEM 2021. [DOI: 10.1002/cjoc.202000489] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Qiaotian Wang
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190, China University of Chinese Academy of Sciences Beijing 100049 China
| | - Wei Meng
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190, China University of Chinese Academy of Sciences Beijing 100049 China
| | - Xiangqing Feng
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190, China University of Chinese Academy of Sciences Beijing 100049 China
| | - Haifeng Du
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190, China University of Chinese Academy of Sciences Beijing 100049 China
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31
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Liu Y, Li JL, Liu XG, Wu JQ, Huang ZS, Li Q, Wang H. Radical Borylative Cyclization of Isocyanoarenes with N-Heterocyclic Carbene Borane: Synthesis of Borylated Aza-arenes. Org Lett 2021; 23:1891-1897. [PMID: 33591193 DOI: 10.1021/acs.orglett.1c00309] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Borylated aza-arenes are of great importance in the area of organic synthesis. A radical borylative cyclization of isocyanoarenes with N-heterocyclic carbene borane (NHC-BH3) under metal-free conditions was developed. The reaction allows the efficient assembly of several types of borylated aza-arenes (phenanthridines, benzothiazoles, etc.), which are difficult to access using alternative methods. Mild reaction conditions, a good functional-group tolerance, and generally good efficiencies were observed. The utility of these products is demonstrated, and the mechanism is discussed.
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Affiliation(s)
- Yao Liu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Ji-Lin Li
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Xu-Ge Liu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Jia-Qiang Wu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Zhi-Shu Huang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Qingjiang Li
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Honggen Wang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
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32
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Kawamoto T, Morioka T, Noguchi K, Curran DP, Kamimura A. Inverse Hydroboration of Imines with NHC-Boranes Is Promoted by Diphenyl Disulfide and Visible Light. Org Lett 2021; 23:1825-1828. [PMID: 33621108 DOI: 10.1021/acs.orglett.1c00230] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
We describe a simple and efficient procedure for nucleophilic borylation of imines in the absence of a photoredox catalyst. Visible light irradiation of an acetonitrile solution of an imine, an NHC-borane, and diphenyl disulfide (10 mol %) provides various stable α-amino NHC-boranes in good yields. The reaction proceeds via addition of a nucleophilic boryl radical to an imine, followed by hydrogen abstraction from thiophenol, which is generated from NHC-borane and diphenyl disulfide.
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Affiliation(s)
- Takuji Kawamoto
- Department of Applied Chemistry, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan
| | - Tsubasa Morioka
- Department of Applied Chemistry, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan
| | - Kohki Noguchi
- Department of Applied Chemistry, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan
| | - Dennis P Curran
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Akio Kamimura
- Department of Applied Chemistry, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan
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33
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Takahashi K, Geib SJ, Maeda K, Curran DP, Taniguchi T. Radical trans-Hydroboration of Substituted 1,3-Diynes with an N-Heterocyclic Carbene Borane. Org Lett 2021; 23:1071-1075. [PMID: 33481616 DOI: 10.1021/acs.orglett.0c04284] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Monohydroboration of substituted 1,3-diynes with an N-heterocyclic carbene borane (NHC-borane) occurs under radical conditions using an azo initiator, such as ACCN and AIBN, and a thiol as a polarity-reversal catalyst. The reaction is highly regio- and stereoselective and provides stable NHC-(E)-alkynylalkenylboranes.
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Affiliation(s)
| | - Steven J Geib
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | | | - Dennis P Curran
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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34
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Bryden MA, Zysman-Colman E. Organic thermally activated delayed fluorescence (TADF) compounds used in photocatalysis. Chem Soc Rev 2021; 50:7587-7680. [PMID: 34002736 DOI: 10.1039/d1cs00198a] [Citation(s) in RCA: 124] [Impact Index Per Article: 41.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Organic compounds that show Thermally Activated Delayed Fluorescence (TADF) have become wildly popular as next-generation emitters in organic light emitting diodes (OLEDs). Since 2016, a subset of these have found increasing use as photocatalysts. This review comprehensively highlights their potential by documenting the diversity of the reactions where an organic TADF photocatalyst can be used in lieu of a noble metal complex photocatalyst. Beyond the small number of TADF photocatalysts that have been used to date, the analysis conducted within this review reveals the wider potential of organic donor-acceptor TADF compounds as photocatalysts. A discussion of the benefits of compounds showing TADF for photocatalysis is presented, which paints a picture of a very promising future for organic photocatalyst development.
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Affiliation(s)
- Megan Amy Bryden
- Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St Andrews, St Andrews, KY16 9ST, UK.
| | - Eli Zysman-Colman
- Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St Andrews, St Andrews, KY16 9ST, UK.
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35
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Han J, San HH, Guo A, Wang L, Tang X. Boryl Radical‐Mediated C−H Activation of Inactivated Alkanes for the Synthesis of Internal Alkynes. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000772] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jia‐Bin Han
- School of Chemistry and Chemical Engineering and Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica Huazhong University of Science and Technology 1037 Luoyu Road Wuhan 430074 People's Republic of China
| | - Htet Htet San
- School of Chemistry and Chemical Engineering and Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica Huazhong University of Science and Technology 1037 Luoyu Road Wuhan 430074 People's Republic of China
- Department of Industrial Chemistry Yadanabon University Amarapura Township Mandalay Region 05063 People's Republic of Myanmar
| | - Ao Guo
- School of Chemistry and Chemical Engineering and Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica Huazhong University of Science and Technology 1037 Luoyu Road Wuhan 430074 People's Republic of China
| | - Long Wang
- School of Chemistry and Chemical Engineering and Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica Huazhong University of Science and Technology 1037 Luoyu Road Wuhan 430074 People's Republic of China
| | - Xiang‐Ying Tang
- School of Chemistry and Chemical Engineering and Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica Huazhong University of Science and Technology 1037 Luoyu Road Wuhan 430074 People's Republic of China
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36
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Qu HJ, Yuan L, Jia CX, Yu HT, Xu H. DFT Investigation of Hydrogen Atom Abstraction from NHC-Boranes by Methyl, Ethyl and Cyanomethyl Radicals-Composition and Correlation Analysis of Kinetic Barriers. Molecules 2020; 25:molecules25194509. [PMID: 33019654 PMCID: PMC7582687 DOI: 10.3390/molecules25194509] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 09/21/2020] [Accepted: 09/29/2020] [Indexed: 11/20/2022] Open
Abstract
Understanding the hydrogen atom abstraction (HAA) reactions of N-heterocyclic carbene (NHC)-boranes is essential for extending the practical applications of boron chemistry. In this study, density functional theory (DFT) computations were performed for the HAA reactions of a series of NHC-boranes attacked by •CH2CN, Me• and Et• radicals. Using the computed data, we investigated the correlations of the activation and free energy barriers with their components, including the intrinsic barrier, the thermal contribution of the thermodynamic reaction energy to the kinetic barriers, the activation Gibbs free energy correction and the activation zero-point vibrational energy correction. Furthermore, to describe the dependence of the activation and free energy barriers on the thermodynamic reaction energy or reaction Gibbs free energy, we used a three-variable linear model, which was demonstrated to be more precise than the two-variable Evans–Polanyi linear free energy model and more succinct than the three-variable Marcus-theory-based nonlinear HAA model. The present work provides not only a more thorough understanding of the compositions of the barriers to the HAA reactions of NHC-boranes and the HAA reactivities of the substrates but also fresh insights into the suitability of various models for describing the relationships between the kinetic and thermodynamic physical quantities.
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Affiliation(s)
- Hong-jie Qu
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China; (H.-j.Q.); (L.Y.); (C.-x.J.)
- College of Science, Heilongjiang Bayi Agricultural University, Daqing 163319, China
| | - Lang Yuan
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China; (H.-j.Q.); (L.Y.); (C.-x.J.)
| | - Cai-xin Jia
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China; (H.-j.Q.); (L.Y.); (C.-x.J.)
| | - Hai-tao Yu
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China; (H.-j.Q.); (L.Y.); (C.-x.J.)
- Correspondence: (H.-t.Y.); (H.X.); Tel.: +86-451-86608616 (H.-t.Y.)
| | - Hui Xu
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China; (H.-j.Q.); (L.Y.); (C.-x.J.)
- Correspondence: (H.-t.Y.); (H.X.); Tel.: +86-451-86608616 (H.-t.Y.)
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37
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Qi J, Zhang F, Jin J, Zhao Q, Li B, Liu L, Wang Y. New Radical Borylation Pathways for Organoboron Synthesis Enabled by Photoredox Catalysis. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201915619] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Jing Qi
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry University of Science and Technology of China Hefei 230026 China
| | - Feng‐Lian Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry University of Science and Technology of China Hefei 230026 China
| | - Ji‐Kang Jin
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry University of Science and Technology of China Hefei 230026 China
| | - Qiang Zhao
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry University of Science and Technology of China Hefei 230026 China
| | - Bin Li
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry University of Science and Technology of China Hefei 230026 China
| | - Lin‐Xuan Liu
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry University of Science and Technology of China Hefei 230026 China
| | - Yi‐Feng Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry University of Science and Technology of China Hefei 230026 China
- Center for Excellence in Molecular Synthesis of CAS Hefei 230026 China
- State Key Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 300071 China
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38
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Zhu C, Dong J, Liu X, Gao L, Zhao Y, Xie J, Li S, Zhu C. Photoredox‐Controlled β‐Regioselective Radical Hydroboration of Activated Alkenes with NHC‐Boranes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005749] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Congjun Zhu
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Jie Dong
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Xueting Liu
- Institute of Theoretical and Computational Chemistry School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Liuzhou Gao
- Institute of Theoretical and Computational Chemistry School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Yue Zhao
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Jin Xie
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Shuhua Li
- Institute of Theoretical and Computational Chemistry School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Chengjian Zhu
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Shanghai 200032 China
- College of Chemistry and Molecular Engineering Zhengzhou University Zhengzhou 450001 China
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39
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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] [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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40
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Wang K, Zhuang Z, Ti H, Wu P, Zhao X, Wang H. Et2Zn-promoted β-trans-selective hydroboration of ynamide. CHINESE CHEM LETT 2020. [DOI: 10.1016/j.cclet.2019.11.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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41
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Qi J, Zhang FL, Jin JK, Zhao Q, Li B, Liu LX, Wang YF. New Radical Borylation Pathways for Organoboron Synthesis Enabled by Photoredox Catalysis. Angew Chem Int Ed Engl 2020; 59:12876-12884. [PMID: 32232933 DOI: 10.1002/anie.201915619] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 03/30/2020] [Indexed: 01/20/2023]
Abstract
Radical borylation using N-heterocyclic carbene (NHC)-BH3 complexes as boryl radical precursors has emerged as an important synthetic tool for organoboron assembly. However, the majority of reported methods are limited to reaction modes involving carbo- and/or hydroboration of specific alkenes and alkynes. Moreover, the generation of NHC-boryl radicals relies principally on hydrogen atom abstraction with the aid of radical initiators. A distinct radical generation method is reported, as well as the reaction pathways of NHC-boryl radicals enabled by photoredox catalysis. NHC-boryl radicals are generated via a single-electron oxidation and subsequently undergo cross-coupling with the in-situ-generated radical anions to yield gem-difluoroallylboronates. A photoredox-catalyzed radical arylboration reaction of alkenes was achieved using cyanoarenes as arylating components from which elaborated organoborons were accessed. Mechanistic studies verified the oxidative formation of NHC-boryl radicals through a single-electron-transfer pathway.
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Affiliation(s)
- Jing Qi
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Feng-Lian Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Ji-Kang Jin
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Qiang Zhao
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Bin Li
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Lin-Xuan Liu
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Yi-Feng Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China.,Center for Excellence in Molecular Synthesis of CAS, Hefei, 230026, China.,State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, China
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42
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Bolt DA, Curran DP. Reactions of NHC‐Boranes with Dibenzoyl Peroxide and Benzoic Acid. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000147] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Daniel A. Bolt
- Department of ChemistryUniversity of Pittsburgh Pittsburgh PA USA 15208
| | - Dennis P. Curran
- Department of ChemistryUniversity of Pittsburgh Pittsburgh PA USA 15208
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43
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Zhu C, Dong J, Liu X, Gao L, Zhao Y, Xie J, Li S, Zhu C. Photoredox‐Controlled β‐Regioselective Radical Hydroboration of Activated Alkenes with NHC‐Boranes. Angew Chem Int Ed Engl 2020; 59:12817-12821. [DOI: 10.1002/anie.202005749] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Indexed: 12/12/2022]
Affiliation(s)
- Congjun Zhu
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Jie Dong
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Xueting Liu
- Institute of Theoretical and Computational Chemistry School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Liuzhou Gao
- Institute of Theoretical and Computational Chemistry School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Yue Zhao
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Jin Xie
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Shuhua Li
- Institute of Theoretical and Computational Chemistry School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Chengjian Zhu
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Shanghai 200032 China
- College of Chemistry and Molecular Engineering Zhengzhou University Zhengzhou 450001 China
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44
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Xu W, Jiang H, Leng J, Ong H, Wu J. Visible‐Light‐Induced Selective Defluoroborylation of Polyfluoroarenes,
gem
‐Difluoroalkenes, and Trifluoromethylalkenes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201911819] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Wengang Xu
- Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 Singapore
- College of New Energy, Institute of New Energy State Key Laboratory of Heavy Oil Processing China University of Petroleum (East China) Qingdao 266580 P. R. China
| | - Heming Jiang
- Laboratory of Computational Chemistry & Drug Design State Key Laboratory of Chemical Oncogenomics Peking University Shenzhen Graduate School Shenzhen 518055 P. R. China
| | - Jing Leng
- Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 Singapore
- State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology 122 Luoshi Road Wuhan Hubei 430070 P. R. China
| | - Han‐Wee Ong
- Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 Singapore
| | - Jie Wu
- Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 Singapore
- National University of Singapore (Suzhou) Research Institute 377 Lin Quan Street, Suzhou Industrial Park Suzhou Jiangsu 215123 P. R. China
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45
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Xu W, Jiang H, Leng J, Ong HW, Wu J. Visible-Light-Induced Selective Defluoroborylation of Polyfluoroarenes, gem-Difluoroalkenes, and Trifluoromethylalkenes. Angew Chem Int Ed Engl 2020; 59:4009-4016. [PMID: 31851417 DOI: 10.1002/anie.201911819] [Citation(s) in RCA: 117] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 12/07/2019] [Indexed: 11/10/2022]
Abstract
Fluorinated organoboranes serve as versatile synthetic precursors for the preparation of value-added fluorinated organic compounds. Recent progress has been mainly focused on the transition-metal catalyzed defluoroborylation. Herein, we report a photocatalytic defluoroborylation platform through direct B-H activation of N-heterocyclic carbene boranes, through the synergistic merger of a photoredox catalyst and a hydrogen atom transfer catalyst. This atom-economic and operationally simple protocol has enabled defluoroborylation of an extremely broad scope of multifluorinated substrates including polyfluoroarenes, gem-difluoroalkenes, and trifluoromethylalkenes in a highly selective fashion. Intriguingly, the defluoroborylation protocol can be transition-metal free, and the regioselectivity obtained is complementary to the reported transition-metal-catalysis in many cases.
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Affiliation(s)
- Wengang Xu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.,College of New Energy, Institute of New Energy, State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao, 266580, P. R. China
| | - Heming Jiang
- Laboratory of Computational Chemistry & Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen, 518055, P. R. China
| | - Jing Leng
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.,State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, 122 Luoshi Road, Wuhan, Hubei, 430070, P. R. China
| | - Han-Wee Ong
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Jie Wu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.,National University of Singapore (Suzhou) Research Institute, 377 Lin Quan Street, Suzhou Industrial Park, Suzhou, Jiangsu, 215123, P. R. China
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46
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Shimoi M, Kevlishvili I, Watanabe T, Maeda K, Geib SJ, Curran DP, Liu P, Taniguchi T. The Thermal Rearrangement of an NHC-Ligated 3-Benzoborepin to an NHC-Boranorcaradiene. Angew Chem Int Ed Engl 2020; 59:903-909. [PMID: 31670450 DOI: 10.1002/anie.201912234] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Indexed: 11/08/2022]
Abstract
An N-heterocyclic-carbene-ligated 3-benzoborepin with a bridged structure has been synthesized by double radical trans-hydroboration of benzo[3,4]cycloundec-3-ene-1,5-diyne with an N-heterocyclic carbene borane. The thermal reaction of the NHC-ligated borepin at 150 °C gives an isolable NHC-boranorcaradiene. Experiments and density functional theory calculations support a mechanism whereby the borepin initially rearranges to a boranorcaradiene by a thermal 6π-electrocyclic reaction. This is followed by 1,5-boron shift to give a rearranged boranorcaradiene. This shift occurs with stereoinversion at boron through a transition state with open-shell diradical character. This is the first example of the isolation of a boranorcaradiene from a thermal reaction of a borepin.
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Affiliation(s)
- Masaki Shimoi
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan
| | - Ilia Kevlishvili
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Takashi Watanabe
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan
| | - Katsuhiro Maeda
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan.,Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan
| | - Steven J Geib
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Dennis P Curran
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Tsuyoshi Taniguchi
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan
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47
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Liu X, Ming W, Friedrich A, Kerner F, Marder TB. Copper-Catalyzed Triboration of Terminal Alkynes Using B 2 pin 2 : Efficient Synthesis of 1,1,2-Triborylalkenes. Angew Chem Int Ed Engl 2020; 59:304-309. [PMID: 31502712 PMCID: PMC6972586 DOI: 10.1002/anie.201908466] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 08/31/2019] [Indexed: 02/04/2023]
Abstract
We report herein the catalytic triboration of terminal alkynes with B2 pin2 (bis(pinacolato)diboron) using readily available Cu(OAc)2 and Pn Bu3 . Various 1,1,2-triborylalkenes, a class of compounds that have been demonstrated to be potential matrix metalloproteinase (MMP-2) inhibitors, were obtained directly in moderate to good yields. The process features mild reaction conditions, a broad substrate scope, and good functional group tolerance. This copper-catalyzed reaction can be conducted on a gram scale to produce the corresponding 1,1,2-triborylalkenes in modest yields. The utility of these products was demonstrated by further transformations of the C-B bonds to prepare gem-dihaloborylalkenes (F, Cl, Br), monohaloborylalkenes (Cl, Br), and trans-diaryldiborylalkenes, which serve as important synthons and have previously been challenging to prepare.
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Affiliation(s)
- Xiaocui Liu
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Wenbo Ming
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Alexandra Friedrich
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Florian Kerner
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Todd B. Marder
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
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48
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Manar KK, Porwal VK, Kamte RS, Adhikari M, Thakur SK, Bawari D, Choudhury AR, Singh S. Reactions of a BICAAC with hydroboranes: propensity for Lewis adduct formation and carbene insertion into the B-H bond. Dalton Trans 2019; 48:17472-17478. [PMID: 31714564 DOI: 10.1039/c9dt03382c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactivity of a bicyclic (alkyl)(amino)carbene (BICAAC) towards different boranes has been examined in the present work. The reactions with boranes BX3·SMe2 (X = H, Cl, Br), BF3·OEt2 and BCl3 yield Lewis adducts [BICAAC·BH3] (1), [BICAAC·BHCl2] (2), [BICAAC·BH2Cl] (3), [BICAAC·BF3] (4), [BICAAC·BCl3] (5) and [BICAAC·BBr3] (6) respectively, whereas more hydridic boranes, 9-borabicyclo[3.3.1]nonane (9-BBN) and catecholborane (HBcat), enable the insertion of the carbene carbon into the B-H bond to form [BICAAC(H)-(9-BBN)] (7) and [BICAAC(H)-Bcat] (8). These complexes are the first examples of BICAAC-boron compounds and have been characterized using IR, multinuclear NMR spectroscopy, HRMS spectrometry and single crystal X-ray diffraction. Computational analyses were also performed to gain insight into the mechanism of B-H bond activation and adduct formation. Furthermore, the reactions of the BICAAC with boranes have been compared with the known reactions of CAACs and NHCs.
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Affiliation(s)
- Krishna K Manar
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Knowledge City, Sector 81, SAS Nagar, Mohali 140306, Punjab, India.
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49
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Shimoi M, Kevlishvili I, Watanabe T, Maeda K, Geib SJ, Curran DP, Liu P, Taniguchi T. The Thermal Rearrangement of an NHC‐Ligated 3‐Benzoborepin to an NHC‐Boranorcaradiene. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201912234] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Masaki Shimoi
- Graduate School of Natural Science and Technology Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
| | - Ilia Kevlishvili
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Takashi Watanabe
- Graduate School of Natural Science and Technology Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
| | - Katsuhiro Maeda
- Graduate School of Natural Science and Technology Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
- Nano Life Science Institute (WPI-NanoLSI) Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
| | - Steven J. Geib
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Dennis P. Curran
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Peng Liu
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Tsuyoshi Taniguchi
- Graduate School of Natural Science and Technology Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
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50
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Liu X, Ming W, Friedrich A, Kerner F, Marder TB. Kupfer‐katalysierte Triborierung terminaler Alkine mit B
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: Effiziente Synthese von 1,1,2‐Triborylalkenen. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201908466] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Xiaocui Liu
- Institut für Anorganische Chemie und Institut für Nachhaltige Chemie & Katalyse mit Bor Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Wenbo Ming
- Institut für Anorganische Chemie und Institut für Nachhaltige Chemie & Katalyse mit Bor Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Alexandra Friedrich
- Institut für Anorganische Chemie und Institut für Nachhaltige Chemie & Katalyse mit Bor Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Florian Kerner
- Institut für Anorganische Chemie und Institut für Nachhaltige Chemie & Katalyse mit Bor Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Todd B. Marder
- Institut für Anorganische Chemie und Institut für Nachhaltige Chemie & Katalyse mit Bor Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
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