Unmodified Primary Amine Organocatalysts for Asymmetric Michael Reactions in Aqueous Media
作者:Maria Rogozińska-Szymczak、Jacek Mlynarski
DOI:10.1002/ejoc.201500913
日期:2015.9
The organocatalytic asymmetric Michael addition of aldehydes to a nitro olefin in aqueous organic solvents catalysed by a broad range of simple primary amines and amino alcohols is reported. In particular, the use of (S,S)-diphenylethylenediamine, which is the chiral backbone of various organocatalysts, gave addition products in good yields and with good to high enantioselectivities (45–96 % ee). Remarkably
据报道,在水性有机溶剂中,醛与硝基烯烃的有机催化不对称迈克尔加成反应由范围广泛的简单伯胺和氨基醇催化。特别是,使用 (S,S)-二苯基乙二胺是各种有机催化剂的手性主链,以良好的收率和良好的对映选择性(45-96% ee)得到加成产物。在水性有机溶剂混合物中,α,α-二取代醛与硝基苯乙烯 (96-98% ee) 的高要求共轭加成被观察到显着高的对映选择性。