Enantioselective Organocatalytic Michael Addition of Aliphatic Ketones to Nitrodienes
作者:Tianxiong He、Xin-Yan Wu
DOI:10.1080/00397911.2010.529227
日期:2012.3.1
Abstract A highly enantioselectiveMichaeladdition of aliphatic ketones to nitrodienes has been achieved that is catalyzed by readily available chiral thioureas derived from (1R,2R)-diphenylethane-1,2-diamine. Treatment of ketones with nitrodienes in the presence of 10 mol% thiourea 1a and 10 mol% benzoic acid in toluene provided the desired Michael adducts with excellent enantioselectivities (up to 99%