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
Enantioselective Organocatalyzed Sulfenylation of 3-Substituted Oxindoles
作者:Xin Li、Cong Liu、Xiao-Song Xue、Jin-Pei Cheng
DOI:10.1021/ol301833f
日期:2012.9.7
A highly enantioselectivesulfenylation reaction with respect to 3-substituted oxindoles and electrophilic sulfur reagents by a quinidine catalyst was investigated.