Enamine-Metal Lewis Acid Bifunctional Catalysis: Application to Direct Asymmetric Aldol Reaction of Ketones
作者:Zhenghu Xu、Philias Daka、Ilya Budik、Hong Wang、Fu-Quan Bai、Hong-Xing Zhang
DOI:10.1002/ejoc.200900678
日期:2009.9
Unprecedented bifunctional enamine–metal Lewis acid catalysts have been developed. In this bifunctional catalytic system, a tridentate ligand tethered with a chiral secondary amine was designed to solve the acid–base self-quenching problem leading to catalyst inactivation. This new bifunctional enamine–metal Lewis acid catalyst was found to catalyze aldol reactions of ketones efficiently in high yields
已经开发出前所未有的双功能烯胺-金属路易斯酸催化剂。在这种双功能催化系统中,设计了一种与手性仲胺相连的三齿配体,以解决导致催化剂失活的酸碱自淬灭问题。发现这种新型双功能烯胺-金属路易斯酸催化剂能够以高产率有效催化酮的羟醛反应,并具有良好到优异的非对映选择性和对映选择性。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)