Asymmetric Michael Addition Reaction of 3-Substituted Oxindoles to Nitroolefins Catalyzed by a Chiral Alkyl- Substituted Thiourea Catalyst
作者:Xin Li、Bo Zhang、Zhi-Guo Xi、Sanzhong Luo、Jin-Pei Cheng
DOI:10.1002/adsc.200900630
日期:2010.2.15
A simple alkylthiourea was found to be an effective catalyst for the Michael addition reaction of 3-substituted oxindole to nitroolefins. A number of 3,3′-substituted oxindole derivatives, which have two vicinal quaternary-tertiary chiral centers were synthesized with up to 99% yield, 19:1 dr and 98% ee.
发现简单的烷基硫脲是3-取代的羟吲哚与硝基烯烃的迈克尔加成反应的有效催化剂。合成了多个具有两个相邻的季-三级手性中心的3,3'-取代的吲哚衍生物,收率高达99%,dr为19:1和ee为98%。