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 enantioselective Michael addition 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%
摘要 脂肪族酮与硝基二烯的高度对映选择性迈克尔加成是由衍生自 (1R,2R)-二苯基乙烷-1,2-二胺的容易获得的手性硫脲催化的。在甲苯中存在 10 mol% 硫脲 1a 和 10 mol% 苯甲酸的情况下,用硝基二烯处理酮可提供所需的迈克尔加合物,其具有优异的对映选择性(高达 99% ee)和中等至极好的产率(高达 97%)。图形概要