Highly Enantioselective Intermolecular Alkylation of Aldehydes with Alcohols by Cooperative Catalysis of Diarylprolinol Silyl Ether with Brønsted Acid
作者:Jian Xiao、Kai Zhao、Teck-Peng Loh
DOI:10.1002/asia.201100692
日期:2011.11.4
Two cooperative systems: I/2,3,4‐trihydroxybenzoic acid and I/TfOH effect highly enantioselective intermolecular α‐alkylation of aldehydes. These systems afford functionalized aldehydes in high yields, and with excellent ee and de values with broad substrate scope (see scheme; R1=alkyl, R2,R3=aryl, or R2=ferrocenyl, R3=phenyl, or R2=indolyl, R3=phenyl).
两个合作体系:I / 2,3,4-三羟基苯甲酸和I / TfOH可实现醛的高度对映选择性分子间α-烷基化。这些系统可提供高收率的官能化醛,并具有出色的ee和de值,且具有广泛的底物范围(参见方案; R 1 =烷基,R 2,R 3 =芳基或R 2 =二茂铁基,R 3 =苯基或R 2 =吲哚基,R 3 =苯基。