chiral Lewis base. This reaction proceeds through a synergistic catalytic cycle which consists of one cycle leading to a chiral iminium electrophile and a second cycle generating a nucleophilic chiral enolate for the construction of a carbon-carbon bond. By varying the combinations of catalyst enantiomers, all four stereoisomers of the products with two vicinal stereocenters are accessible with high
我们在此报告了一种通过手性
吡咯烷和手性路易斯碱的组合催化芳基
乙酸酯与 α,β-不饱和醛的迈克尔加成的立体发散方法。该反应通过协同催化循环进行,该循环包括一个循环导致手性
亚胺亲电试剂和第二个循环产生亲核手性烯醇化物以构建碳-碳键。通过改变催化剂对映异构体的组合,具有两个邻位立体中心的产物的所有四种立体异构体都可以以高对映选择性和非对映选择性获得。迈克尔加成的产物,1,5-醛酯,可以很容易地转化为各种其他有价值的对映体富集结构,包括那些在无环系统中带有三个连续立体中心的结构,