Rhodium-catalyzed asymmetric hydrogenation of β-acetylamino acrylonitriles
摘要:
The rhodium-catalyzed asymmetric hydrogenation of beta-acetylamino acrylonitriles was investigated by using monophosphine and bisphosphine ligands. It was found that an Rh-QuinoxP* complex exhibited high enantioselectivities for beta-aryl substituted beta-acetylamino acrylonitriles and the Rh-JosiPhos CyPF-t-Bu complex was proven to be effective for the hydrogenation of tetrasubstituted olefins from cyclic beta-acetylamino acrylonitriles. (C) 2011 Elsevier Ltd. All rights reserved.
It takes two to TangPhos: β‐Amino acrylonitriles can be readily prepared from acetonitriles. Both of the E/Z isomers undergo hydrogenation with excellent enantioselectivity by using the Rh–TangPhos (TangPhos=1,1′‐di‐tert‐butyl‐(2,2′)‐diphospholane) catalyst system. The products, chiral β‐amino nitriles, are valuable chiral building blocks for many drugs.
Rhodium-catalyzed asymmetric hydrogenation of β-acetylamino acrylonitriles
作者:Miaofeng Ma、Guohua Hou、Junru Wang、Xumu Zhang
DOI:10.1016/j.tetasy.2011.01.023
日期:2011.3
The rhodium-catalyzed asymmetric hydrogenation of beta-acetylamino acrylonitriles was investigated by using monophosphine and bisphosphine ligands. It was found that an Rh-QuinoxP* complex exhibited high enantioselectivities for beta-aryl substituted beta-acetylamino acrylonitriles and the Rh-JosiPhos CyPF-t-Bu complex was proven to be effective for the hydrogenation of tetrasubstituted olefins from cyclic beta-acetylamino acrylonitriles. (C) 2011 Elsevier Ltd. All rights reserved.