Chemo-enzymatic synthesis of 1,2- and 1,3- amino-alcohols and their use in the enantioselective reduction of acetophenone and anti-acetophenone oxime methyl ether with borane.
作者:Eric Didier、Bernard Loubinoux、Gerardo H. Ramos Tombo、Grety Rihs
DOI:10.1016/s0040-4020(01)80959-5
日期:1991.1
New chiral amino-alcohols were enantioselectively synthesized using biotransformations as the key steps. They were used as ligand in the enantioselective borane reduction of acetophenone and of the corresponding anti oxime methylether.
Novel enantiomerically pure 2-piperazinemethanols (3-5) were synthesized from 2-piperazinecarboxylic acid 1. The asymmetric reduction of aromatic ketones, ketimine and oxime ether has been performed with reagents prepared from 2-piprazinemethanol and borane to yield enantiomerically enriched alcohols and amines, respectively. The preferred absolute configuration of the product was dependent on the structure of the sulfonyl substituent in the chiral ligand. (C) 1999 Elsevier Science Ltd. All rights reserved.
CN117185953
申请人:——
公开号:——
公开(公告)日:——
Nickel-catalysed asymmetric hydrogenation of oximes
作者:Bowen Li、Jianzhong Chen、Dan Liu、Ilya D. Gridnev、Wanbin Zhang
DOI:10.1038/s41557-022-00971-8
日期:2022.8
corresponding chiral hydroxylamines remains challenging because of the labile N–O bond and inert C=N bond. Here we report an environmentally friendly, earth-abundant, transition-metal nickel-catalysed asymmetric hydrogenation of oximes, affording the corresponding chiral hydroxylamines with up to 99% yield, 99% e.e. and with a substrate/catalyst ratio of 1,000. Computational results indicate that the weak interactions