Chiral <i>N</i>,<i>N′</i>-Dioxide/Lanthanide(III) Complex Catalyzed Asymmetric Bisvinylogous Mukaiyama Aldol Reactions
作者:Kai Fu、Jingchuan Zhang、Lili Lin、Jun Li、Xiaohua Liu、Xiaoming Feng
DOI:10.1021/acs.orglett.6b03470
日期:2017.1.20
complexes have been developed as efficient catalysts for the bisvinylogous Mukaiyama aldol reaction of silyl ketene acetal with α-ketoesters and aldehydes, respectively. The catalytic systems were highly ε-selective, and the substrate scope was wide. The corresponding ε-hydroxy-α,β,γ,δ-unsaturated esters were obtained in up to 95% yield and 98% ee.
已开发出手性N,N'-二氧化物/ Y(OTf)3和Sc(OTf)3配合物,分别作为甲硅烷基乙烯酮缩醛与α-酮酸酯和醛类双乙烯基木的Mukaiyama aldol反应的有效催化剂。催化体系具有高度的ε选择性,并且底物范围广。以高达95%的收率和98%的ee获得相应的ε-羟基-α,β,γ,δ-不饱和酯。