Asymmetric Conjugate Addition of Oxindoles to 2-Chloroacrylonitrile: A Highly Effective Organocatalytic Strategy for Simultaneous Construction of 1,3-Nonadjacent Stereocenters Leading to Chiral Pyrroloindolines
作者:Xin Li、Sanzhong Luo、Jin-Pei Cheng
DOI:10.1002/chem.201002563
日期:2010.12.27
Chiral pyrroloindoles: A highly enantioselective catalytic conjugate addition of 3‐substituted oxindoles with 2‐chloroacrylonitrile has been developed with a readily accessible alkyl bifunctional tertiary amine thiourea catalyst. Excellent stereoselectivity of up to >30:1 diastereomeric ratio and 99 % enantiomeric excess was achieved. The obtained Michael products could be easily converted to chiral
手性吡咯并吲哚:已开发出一种易于使用的烷基双官能叔胺硫脲催化剂,可将3-取代的羟吲哚与2-氯丙烯腈进行高度对映选择性催化共轭加成反应。获得了高达> 30:1的非对映异构体比例和99%对映体过量的出色立体选择性。获得的迈克尔产物可以容易地转化为手性吡咯并吲哚结构,其广泛分布于天然吲哚生物碱中(参见方案)。