Amino-Indanol-Catalyzed Asymmetric Michael Additions of Oxindoles to Protected 2-Amino-1-nitroethenes for the Synthesis of 3,3′-Disubstituted Oxindoles Bearing α,β-Diamino Functionality
作者:Xiong-Li Liu、Zhi-Jun Wu、Xi-Lin Du、Xiao-Mei Zhang、Wei-Cheng Yuan
DOI:10.1021/jo2004378
日期:2011.5.20
An organocatalytic asymmetric Michael addition reaction of 3-substituted oxindoles to protected 2-amino-1-nitroethenes has been developed. The reaction is catalyzed by a simple and readily available amino-indanol derivative and affords the desired products in very high yields (up to 99%) with excellent diastereoselectivities (up to >99:1) and very good enantioselectivities (up to 90%). Significantly
已经开发出3-取代的羟吲哚与被保护的2-氨基-1-硝基乙烯的有机催化不对称迈克尔加成反应。该反应由一种简单易得的氨基氨基茚满醇衍生物催化,以非常高的非对映选择性(高达> 99:1)和非常好的对映选择性(高达90%)以非常高的收率(高达99%)提供所需的产物。 。重要的是,这项研究为构建带有α,β-二氨基官能团的3,3′-二取代的羟吲哚以及邻近的手性季/叔立体中心提供了一种通用的催化方法。该协议的潜在效用也已通过克级反应和产物的多用途转化得到了证明。此外,根据全面的实验结果和其中一种迈克尔加合物的绝对构型,