One-Pot Construction of Multiple Contiguous Chiral Centers Using Michael Addition of Chiral Amine
作者:Minoru Ozeki、Shunsuke Ochi、Noboru Hayama、Shinzo Hosoi、Tetsuya Kajimoto、Manabu Node
DOI:10.1021/jo1004586
日期:2010.6.18
Multiple contiguous chiral centers were constructed in one pot using three types of multistep reactions initiated with the Michael addition of N-benzyl-2(R)-methoxy-(+)-10-bornylamide to α,β-unsaturated esters, i.e., asymmetric Michael−aldol reaction, double Michael addition, and double Michael−aldol reaction. The chiral 2-methoxy-10-bornyl group as well as the benzyl group on the amino group of the
使用三种类型的多步反应,在一个锅中构建多个连续的手性中心,其中三步反应是通过将N-苄基-2(R)-甲氧基-(+)-10-冰片酰胺迈克尔加成至α,β-不饱和酯(即不对称酯)迈克尔·奥尔多反应,迈克尔加成反应加倍和迈克尔·奥尔多反应加倍。通过用NIS(4当量)和多个连续的β-氨基酯处理,可以很容易地裂解迈克尔-醛醇缩合反应中产物的手性2-甲氧基-10-冰片基以及氨基上的苄基以高收率获得手性中心。作为应用,在不对称迈克尔-醛醇缩合反应中获得的β-氨基-β'-羟基酯以高收率转化为β-内酰胺衍生物。