METHOD FOR PRODUCING OPTICALLY ACTIVE ALPHA-SUBSTITUTED PROLINE
申请人:API CORPORATION
公开号:US20140127762A1
公开(公告)日:2014-05-08
The present invention aims to provide an industrial method practically suitable for producing optically active α-substituted prolines from an acyclic ketone compound by a small number of steps under mild conditions. The present invention relates to a production method of an optically active α-substituted proline (4) and/or an optically active α-substituted prolinamide (5), including (a) reacting an acyclic ketone compound (1) with at least one selected from ammonia, an ammonium salt, primary amine and a salt of primary amine, and a cyanating agent to give a cyclic nitrogen-containing compound (2), (b) hydrating the cyclic nitrogen-containing compound (2) to give an α-substituted prolinamide (3), and (c) resolving the α-substituted prolinamide (3) by one or more of (d) enzymatical hydrolysis, (e) resolution by diastereomeric salt formation, and (f) separation by column chromatography.
Remote Stereocenter through Amide-Directed, Rhodium-Catalyzed Enantioselective Hydroboration of Unactivated Internal Alkenes
作者:Wei Zhao、Ke-Zhi Chen、An-Zhen Li、Bi-Jie Li
DOI:10.1021/jacs.2c05993
日期:2022.7.27
bioactive molecules, the direct catalytic asymmetric synthesis of this structural motif containing a remote stereocenter remains an important synthetic challenge. Here, we report an amide-directed, rhodium-catalyzed highly diastereo- and enantioselective hydroboration of unactivated internal alkenes. This method provided facile access to enantioenriched amines containing β,γ-vicinal stereocenters. The