Cinchona-based primary amine-catalyzed enantioselective aza-Michael reactions of pyrroles with α,β-unsaturated aldehydes
摘要:
The cinchona-based primary amine-catalyzed enantioselective aza-Michael reaction of alpha,beta-unsaturated aldehydes with 4,5-dihalo-1H-pyrrole-2-carbonitriles as the N-centered heteroaromatic nucleophile, followed by chemoselective reduction provided the corresponding chiral aza-Michael products in good yields and with excellent enantioselectivities (90-97% ee). (C) 2014 Elsevier Ltd. All rights reserved.
Organocatalytic enantioselective formal synthesis of bromopyrrole alkaloids via aza-Michael addition
作者:Su-Jeong Lee、Seok-Ho Youn、Chang-Woo Cho
DOI:10.1039/c1ob06078c
日期:——
An unprecedented organocatalyticenantioselective formal synthesis of bromopyrrole alkaloid natural products is reported. An organocatalytic aza-Michael additionusing pyrroles as the N-centered nucleophile is utilized as the enantioselective step to construct the nitrogen-substituted stereogenic carbon center in bromopyrrole alkaloids in good yield and excellent enantioselectivity. The aza-Michael