Simple, Catalytic Enantioselective Syntheses of Estrone and Desogestrel
作者:Qi-Ying Hu、Pankaj D. Rege、E. J. Corey
DOI:10.1021/ja048808x
日期:2004.5.1
Highly enantioselective and very shortsyntheses of the bioactive forms of estrone (3) and desogestrel (4) are described using a chiral oxazaborolidinium catalyst (2) in the key initial step. Enantiomerically pure estrone was synthesized in eight steps from the readily available starting materials diene 5 and alpha,beta-enal 6 viaintermediates 8 and 9. Desogestrel was synthesized using a similar strategy