The ability of intermolecular cooperative thiourea/oxime hydrogen-bond catalysis for improving and accelerating asymmetric aminocatalysis is disclosed. The two readily available hydrogen-bond-donating catalysts operate in synergy with a chiral amine catalyst to accomplish a plethora of highly stereoselective transformations.
Merging Organocatalysis with Transition Metal Catalysis: Highly Stereoselective α-Alkylation of Aldehydes
作者:Jian Xiao
DOI:10.1021/ol3002859
日期:2012.4.6
The unprecedented cooperative systems involving a diarylprolinol silyl ether with various Lewis acids have been found to effect the highly enantioselective intermolecular alpha-alkylation of aldehydes. A wide variety of aldehydes and alcohols can be transformed into the desired highly functionalized aldehydes In high yields, excellent enantioselectivities, and good diastereoselectivities at room temperature under mild conditions.