Improved Enantioselectivity in the Epoxidation of Cinnamic Acid Derivatives with Dioxiranes from Keto Bile Acids
作者:Olga Bortolini、Giancarlo Fantin、Marco Fogagnolo、Roberto Forlani、Silvia Maietti、Paola Pedrini
DOI:10.1021/jo020146b
日期:2002.8.1
The asymmetric epoxidation of substituted cinnamic acids has been obtained in the presence of different keto bile acid derivatives as optically active carbonyl inducers and Oxone as oxygen source. Predominant or almost exclusive formation of both enantiomeric epoxides is obtained (ee up to 95%) depending on the specific substitution at carbons C(7) and C(12) of the bile acid.