A highly enantioselective intermolecular benzylic C(sp3)−H bond amination by using a chiral cationic copper catalyst and oxidant di-tert-butyl peroxide is reported. This mild, straightforward method can be used to transform an array of feedstock alkylarenes and amides into chiral amines with high enantioselectivities, and it has good functional group tolerance and a broad substrate scope.
Metallaphotoredox‐Catalyzed Enantioselective Cross‐Electrophile Coupling Using Alcohols as Reducing Agents
作者:Zhilong Li、Leitao Huan、Jian Li、Xiaomin Shu、De Zhong、Wenjing Zhang、Haohua Huo
DOI:10.1002/anie.202305889
日期:2023.8
An enantioselective coupling of α-amino acid derivatives and aryl bromides, using Ni/photoredox catalysis and alcohols as reducingagents, is reported. This protocol offers modular access to enantioenriched benzylic amines from abundant precursors, and is suitable for late-stage diversification with broad functional group tolerance. The alcohol-based approach holds potential as a general platform for
Merging Nucleophilic and Hydrogen Bonding Catalysis: An Anion Binding Approach to the Kinetic Resolution of Amines
作者:Chandra Kanta De、Eric G. Klauber、Daniel Seidel
DOI:10.1021/ja9079435
日期:2009.12.2
A new concept for asymmetric nucleophilic catalysis is presented. Acyl pyridinium salts derived from 4-(dimethylamino)pyridine (DMAP) and benzoic anhydride are rendered chiral via interaction with a chiral thiourea anion receptor. The power of this concept is demonstrated in the context of kinetic amine resolution.
Commercial transaminases for the asymmetric synthesis of bulky amines.
Commercially available transaminases are valuable tools for the synthesis of chiral amine building blocks and are very accessible to the synthetic chemistry community. We demonstrate that selected commercially available enzymes from Codexis’ transaminase collection can accept and aminate bulky-bulky ketones in up to 99 % ee.