申请人:Nisshin Flour Milling Co., Ltd.
公开号:US04723045A1
公开(公告)日:1988-02-02
New processes for preparing cholesta-1,5,7-trien-3-ol which is a key intermediate in the synthesis of 1.alpha.-hydroxyvitamin D.sub.3. The processes utilize the steps of reacting cholesta-1,4,6-trien-3-one with isopropenyl acetate in the presence of an acid catalyst followed by reduction of the resultant cholesta-1,3,5,7-tetraen-3-yl-acetate.
制备1,5,7-胆甾三烯-3-醇的新工艺,该化合物是合成1α-羟基维生素D3的关键中间体。这些工艺利用了将1,4,6-胆甾三烯-3-酮与异丙烯醋酸酯在酸催化剂存在下反应,随后还原产生的1,3,5,7-四烯-3-醇醋酸酯的步骤。