Enantioselective cyanocarbonation of ketones with chiral base
摘要:
A highly enantioselective cyanocarbonation of dialkyl ketones catalyzed by commercially available and easily recyclable cinchona alkaloid derivatives has been developed. The reaction provides a useful approach for the enantioselective construction of tetrasubstituted carbon stereocenters. Mechanistic studies have been carried out to shed light on the origin of the catalytic activity of the cinchona alkaloid and the asymmetric induction step. (c) 2006 Elsevier Ltd. All rights reserved.
An organophosphine‐catalyzed enantioselective cyanosilylation of carbonyl compounds has been disclosed for the first time. This process, the dual‐reagent catalysis serves as a powerful tool, affording the desired cyanohydrin trimethylsilyl ethers in excellent yields (up to 99 %) and good‐to‐excellent enantioselectivities (up to 94 % ee).
Catalytic Enantioselective Total Syntheses of Bisorbicillinolide, Bisorbicillinol, and Bisorbibutenolide
作者:Ran Hong、Yonggang Chen、Li Deng
DOI:10.1002/anie.200500480
日期:2005.5.30
Catalytic Asymmetric Cyanosilylation of Ketones with Chiral Lewis Base
作者:Shi-Kai Tian、Ran Hong、Li Deng
DOI:10.1021/ja036222p
日期:2003.8.1
catalytic approaches for the enantioselective creation of quaternary stereocenters remains a highly desirable yet challenging goal. In this Communication, we describe a highlyenantioselective cyanosilylation of acetal ketones (alpha,alpha-dialkoxy ketones) catalyzed by modified cinchona alkaloids. This reaction is the first highlyenantioselective cyanosilylation of ketones catalyzed by an organic chiral
Enantioselective cyanocarbonation of ketones with chiral base
作者:Shi-Kai Tian、Li Deng
DOI:10.1016/j.tet.2006.06.077
日期:2006.12
A highly enantioselective cyanocarbonation of dialkyl ketones catalyzed by commercially available and easily recyclable cinchona alkaloid derivatives has been developed. The reaction provides a useful approach for the enantioselective construction of tetrasubstituted carbon stereocenters. Mechanistic studies have been carried out to shed light on the origin of the catalytic activity of the cinchona alkaloid and the asymmetric induction step. (c) 2006 Elsevier Ltd. All rights reserved.