Process and intermediates for the synthesis of Vitamin D.sub.3
申请人:Hoffmann-La Roche Inc.
公开号:US04360470A1
公开(公告)日:1982-11-23
The present disclosure is directed to a process for the synthesis of chenodeoxychloic acid, 25-hydroxycholesterol and 1.alpha.,25-dihydroxycholesterol from 17-keto steroids. A cholic acid side chain is stereospecifically introduced by reaction of the appropriate 17-keto steroid with ethyltriphenylphosphonium halides to produce the 17-ethylidene derivative which is allowed to react with acrylic acid esters or propiolic acid esters followed by hydrogenation.
Stereoselective Introduction of Steroid Side Chains. Synthesis of Chenodeoxycholic Acid
作者:Peter M. Wovkulich、Andrew D. Batcho、Milan R. Uskokovi?
DOI:10.1002/hlca.19840670229
日期:1984.3.14
A new short route to chenodeoxycholic acid has been developed. The synthesis is based on the stereoselective introduction of the steroidal side chain via an ene reaction of methyl acrylate and a (17Z)-ethylidene steroid prepared from androstenedione.