Enantioselective One-Pot Synthesis of 2-Amino-4-(indol-3-yl)-4H-Chromenes
摘要:
An enantioselective one-pot synthesis of 2-amino-4-(indol-3-yl)-4H-chromenes via a Knoevenagel/Pinner/Friedel-Crafts reaction of salicylaldehyde, malononitrile, and indole is presented. Moderate to good yields (up to 89%) and high enantioselectivities (up to 90% ee) were obtained with an N,N-dioxide-Zn(II) complex as the catalyst. This strategy provides an efficient and convenient method to access enantiomerically enriched 2-amino-4H-chromene derivatives.
Facile synthesis of chiral 2-amino-4-(indol-3-yl)-4H-chromene derivatives using thiourea as the catalyst
作者:Yu Gao、Da-Ming Du
DOI:10.1016/j.tetasy.2013.08.018
日期:2013.10
The enantioselective Friedel-Crafts alkylation of indoles with iminochromenes catalyzed by a bifunctional thiourea organocatalyst was investigated. This reaction afforded chiral functionalized 2-amino-4-(indol-3-yl)-4H-chromenes in good yields (up to 87% yield) and with moderate to good enantioselectivities (up to 86% ee). (C) 2013 Elsevier Ltd. All rights reserved.