Asymmetric aldol additions using bifunctional cinchona-alkaloid-based catalysts
申请人:Deng Li
公开号:US20070112199A1
公开(公告)日:2007-05-17
One aspect of the present invention relates to asymmetric catalytic nitroaldol (Henry) reactions with ketones as the electrophilic component. In one embodiment, the present invention relates to asymmetric nitroaldol reactions with α-keto esters catalyzed by a new C6′-OH cinchona alkaloid catalyst. In certain embodiments, this reaction is operationally simple and affords high enantioselectivity as well as good to excellent yield for an exceptionally broad range of α-keto esters.
US8765955B2
申请人:——
公开号:US8765955B2
公开(公告)日:2014-07-01
Enantioselective Nitroaldol Reaction of α-Ketoesters Catalyzed by Cinchona Alkaloids
作者:Hongming Li、Baomin Wang、Li Deng
DOI:10.1021/ja057237l
日期:2006.1.1
The development of highly enantioselective and general catalytic nitroaldol (Henry) reactions with ketones is a challenging yet desirable task in organic synthesis. In this communication, we report an asymmetric nitroaldol reaction with alpha-ketoesters catalyzed by a new C6'-OH cinchonaalkaloid catalyst. This is the first highly efficient organocatalytic asymmetric Henry reaction with ketones. This