Process for the preparation of 1.alpha.,25-dihydroxyvitamin D.sub.2 and
申请人:Nisshin Flour Milling Co., Ltd.
公开号:US05087709A1
公开(公告)日:1992-02-11
(22E)-5,7,22-Ergostatriene-1.alpha.,3.beta.,25-triol and the 24-epimer thereof which are new intermediates for the synthesis of 1.alpha.,25-dihydroxyvitamin D.sub.2 and the 24-epimer thereof. A new process for the preparation of 1.alpha.,25-dihydroxyvitamin D.sub.2 and the 24-epimer thereof is also described which comprises irradiation of (22E)-5,7,22-ergostatriene-1.alpha.,3.beta.,25-triol or the 24-epimer thereof followed by isomerization.