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Kawada T, Yabushita K, Yasuda T, Ohta T, Yajima T, Tanaka K, Utsumi N, Watanabe M, Murata K, Kayaki Y, Kuwata S, Katayama T. Asymmetric Transfer Hydrogenative Amination of Benzylic Ketones Catalyzed by Cp*Ir(III) Complexes Bearing a Chiral N-(2-Picolyl)sulfonamidato Ligand. J Org Chem 2022; 87:8458-8468. [PMID: 35686909 DOI: 10.1021/acs.joc.2c00580] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A convenient asymmetric reductive amination of benzylic ketones (α-arylated ketones) catalyzed by newly designed Cp*Ir complexes bearing a chiral N-(2-picolyl)sulfonamidato ligand was developed. Using readily available β-amino alcohols as chiral aminating agents, a range of benzo-fused and acyclic ketones were successfully reduced with formic acid in methanol at 40 °C to afford amines with favorable chemo- and diastereoselectivities. The amino alcohol-derived chiral auxiliary was easily removed by mild periodic oxidants, leading to optically active primary β-arylamines without erosion of the optical purity (up to 97% ee). The excellent catalytic performance was retained even upon lowering the amount of catalyst to a substrate/catalyst (S/C) ratio of 20,000, and the amination could be performed on a large scale exceeding 100 g. The precise hydride transfer to iminium species generated from the ketonic substrate and the chiral amine counterpart was suggested by the mechanistic studies on stoichiometric reactions of isolable hydridoiridium complexes and model intermediates such as N,O-acetal, enamine, and iminium compounds.
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Affiliation(s)
- Takuma Kawada
- Central Research Laboratory, Technology & Department Division, Kanto Chemical Co., Inc., 7-1, Inari 1-chome, Soka, Saitama 340-0003, Japan
| | - Kenya Yabushita
- Central Research Laboratory, Technology & Department Division, Kanto Chemical Co., Inc., 7-1, Inari 1-chome, Soka, Saitama 340-0003, Japan
| | - Toshihisa Yasuda
- Central Research Laboratory, Technology & Department Division, Kanto Chemical Co., Inc., 7-1, Inari 1-chome, Soka, Saitama 340-0003, Japan
| | - Takeshi Ohta
- Central Research Laboratory, Technology & Department Division, Kanto Chemical Co., Inc., 7-1, Inari 1-chome, Soka, Saitama 340-0003, Japan
| | - Takaaki Yajima
- Central Research Laboratory, Technology & Department Division, Kanto Chemical Co., Inc., 7-1, Inari 1-chome, Soka, Saitama 340-0003, Japan
| | - Kouichi Tanaka
- Central Research Laboratory, Technology & Department Division, Kanto Chemical Co., Inc., 7-1, Inari 1-chome, Soka, Saitama 340-0003, Japan
| | - Noriyuki Utsumi
- Central Research Laboratory, Technology & Department Division, Kanto Chemical Co., Inc., 7-1, Inari 1-chome, Soka, Saitama 340-0003, Japan
| | - Masahito Watanabe
- Central Research Laboratory, Technology & Department Division, Kanto Chemical Co., Inc., 7-1, Inari 1-chome, Soka, Saitama 340-0003, Japan
| | - Kunihiko Murata
- Central Research Laboratory, Technology & Department Division, Kanto Chemical Co., Inc., 7-1, Inari 1-chome, Soka, Saitama 340-0003, Japan
| | - Yoshihito Kayaki
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Shigeki Kuwata
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Takeaki Katayama
- Central Research Laboratory, Technology & Department Division, Kanto Chemical Co., Inc., 7-1, Inari 1-chome, Soka, Saitama 340-0003, Japan
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Pálvölgyi ÁM, Scharinger F, Schnürch M, Bica‐Schröder K. Chiral Phosphoric Acids as Versatile Tools for Organocatalytic Asymmetric Transfer Hydrogenations. European J Org Chem 2021; 2021:5367-5381. [PMID: 34819797 PMCID: PMC8597106 DOI: 10.1002/ejoc.202100894] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 09/16/2021] [Indexed: 12/05/2022]
Abstract
Herein, recent developments in the field of organocatalytic asymmetric transfer hydrogenation (ATH) of C=N, C=O and C=C double bonds using chiral phosphoric acid catalysis are reviewed. This still rapidly growing area of asymmetric catalysis relies on metal-free catalysts in combination with biomimetic hydrogen sources. Chiral phosphoric acids have proven to be extremely versatile tools in this area, providing highly active and enantioselective alternatives for the asymmetric reduction of α,β-unsaturated carbonyl compounds, imines and various heterocycles. Eventually, such transformations are more and more often used in multicomponent/cascade reactions, which undoubtedly shows their great synthetic potential and the bright future of organocatalytic asymmetric transfer hydrogenations.
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Affiliation(s)
- Ádám Márk Pálvölgyi
- Institute of Applied Synthetic ChemistryTU WienGetreidemarkt Vienna, 9/1631060WienAustria
| | - Fabian Scharinger
- Institute of Applied Synthetic ChemistryTU WienGetreidemarkt Vienna, 9/1631060WienAustria
| | - Michael Schnürch
- Institute of Applied Synthetic ChemistryTU WienGetreidemarkt Vienna, 9/1631060WienAustria
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Zhang L, Zhu R, Feng A, Zhao C, Chen L, Feng G, Liu L. Redox deracemization of β,γ-alkynyl α-amino esters. Chem Sci 2020; 11:4444-4449. [PMID: 34122901 PMCID: PMC8159540 DOI: 10.1039/d0sc00944j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The first non-enzymatic redox deracemization method using molecular oxygen as the terminal oxidant has been described. The one-pot deracemization of β,γ-alkynyl α-amino esters consisted of a copper-catalyzed aerobic oxidation and chiral phosphoric acid-catalyzed asymmetric transfer hydrogenation with excellent functional group compatibility. By using benzothiazoline as the reducing reagent, an exclusive chemoselectivity at the C
Created by potrace 1.16, written by Peter Selinger 2001-2019
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N bond over the C
Created by potrace 1.16, written by Peter Selinger 2001-2019
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C bond was achieved, allowing for efficient deracemization of a series of α-amino esters bearing diverse α-alkynyl substituent patterns. The origins of chemo- and enantio-selectivities were elucidated by experimental and computational mechanistic investigation. The generality of the strategy is further demonstrated by efficient deracemization of β,γ-alkenyl α-amino esters. A one-pot deracemization of β,γ-alkynyl α-amino esters consisting of an aerobic oxidation and chiral phosphoric acid-catalyzed asymmetric transfer hydrogenation has been described.![]()
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Affiliation(s)
- Lu Zhang
- School of Pharmaceutical Sciences, Shandong University Jinan 250012 China
| | - Rongxiu Zhu
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 China
| | - Aili Feng
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 China
| | - Changyin Zhao
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 China
| | - Lei Chen
- School of Pharmaceutical Sciences, Shandong University Jinan 250012 China
| | - Guidong Feng
- School of Pharmaceutical Sciences, Shandong University Jinan 250012 China
| | - Lei Liu
- School of Pharmaceutical Sciences, Shandong University Jinan 250012 China .,School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 China
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Kang S, Lee M, Kim TH. Direct Reductive Amination of Aldehydes Using Hantzsch Ester Promoted by
N,N′
‐Diphenyl‐
S
‐Benzylisothiouronium Iodide as an Organocatalyst. B KOREAN CHEM SOC 2019. [DOI: 10.1002/bkcs.11863] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sungmin Kang
- School of Chemical Engineering, College of EngineeringChonnam National University Gwangju 61186 Republic of Korea
| | - Minhee Lee
- School of Chemical Engineering, College of EngineeringChonnam National University Gwangju 61186 Republic of Korea
| | - Taek Hyeon Kim
- School of Chemical Engineering, College of EngineeringChonnam National University Gwangju 61186 Republic of Korea
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Zhang Q, Zhu W, Yao J, Li X, Zhou H. Electrolysis promoted reductive amination of electron-deficient aldehydes/ketones: a green route to the racemic clopidogrel. Org Biomol Chem 2018; 16:8462-8466. [PMID: 30362487 DOI: 10.1039/c8ob02500b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
An electrocatalytic reductive amination of electron-deficient aldehydes/ketones was developed, which could be used in the synthesis of functionalized tertiary amines and large scale preparation of racemic clopidogrel. A plausible mechanism involving an iminium cation intermediate was proposed.
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Affiliation(s)
- Qianyun Zhang
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, People's Republic of China.
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Xu G, Cao J, Zhao Y, Zheng L, Tao M, Zhang W. Phosphorylated Polyacrylonitrile Fibers as an Efficient and Greener Acetalization Catalyst. Chem Asian J 2017; 12:2565-2575. [PMID: 28727264 DOI: 10.1002/asia.201700846] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 07/15/2017] [Indexed: 12/29/2022]
Affiliation(s)
- Gang Xu
- Department of Chemistry; School of Science; Tianjin University; Tianjin 300072 China
| | - Jian Cao
- Department of Chemistry; School of Science; Tianjin University; Tianjin 300072 China
| | - Yali Zhao
- Department of Chemistry; School of Science; Tianjin University; Tianjin 300072 China
| | - Lishuo Zheng
- Department of Chemistry; School of Science; Tianjin University; Tianjin 300072 China
| | - Minli Tao
- Department of Chemistry; School of Science; Tianjin University; Tianjin 300072 China
| | - Wenqin Zhang
- Department of Chemistry; School of Science; Tianjin University; Tianjin 300072 China
- Department of Chemistry; School of Science; Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300072 China
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Weng G, Ma X, Fang D, Tan P, Wang L, Yang L, Zhang Y, Qian S, Wang Z. Thiourea catalysed reduction of α-keto substituted acrylate compounds using Hantzsch ester as a reducing agent in water. RSC Adv 2017. [DOI: 10.1039/c7ra00995j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The first method for the reduction of α-keto substituted acrylate compounds by Hantzsch ester in water under the catalysis of thiourea has been developed. The products were isolated with moderate to high yields (38–95%).
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Affiliation(s)
| | - Xiaobo Ma
- Department of Chemistry
- Xihua University
- Chengdu
- China
| | - Dongmei Fang
- Chengdu Institute of Biology
- Chinese Academy of Sciences
- Chengdu
- China
| | - Ping Tan
- Department of Chemistry
- Xihua University
- Chengdu
- China
| | - Lijiao Wang
- Department of Chemistry
- Xihua University
- Chengdu
- China
| | - Linlin Yang
- Department of Chemistry
- Xihua University
- Chengdu
- China
| | | | - Shan Qian
- Department of Chemistry
- Xihua University
- Chengdu
- China
| | - Zhouyu Wang
- Department of Chemistry
- Xihua University
- Chengdu
- China
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