The bifunctional quinine-derived thiourea catalyst 14 was found to catalyze the direct amination of unprotected3-aryl and aliphatic substitutedoxindoles with di-tert-butylazodicarboxylate (DBAD) to construct a tetrasubstituted stereogenic carbon center at the C-3 position of oxindoles in good to excellent yield and enantioselectivity.
Highly Enantioselective and Organocatalytic α-Amination of 2-Oxindoles
作者:Liang Cheng、Li Liu、Dong Wang、Yong-Jun Chen
DOI:10.1021/ol901405r
日期:2009.9.3
chiral carbon center was generated by asymmetric amination of N-unprotected 2-oxindoles with azodicarboxylate catalyzed by commercial biscinchona alkaloids in good to excellent yields with high enantioselectivities.