Mixed anhydride steroid intermediate and process for preparing steroid intermediates
申请人:SYNTEX (U.S.A.) INC.
公开号:EP0006355A1
公开(公告)日:1980-01-09
(A process for preparing steroid intermediates of the formula
in which pivaloyl chloride is added to a compound of the formula
the resulting compound of the formula
is reacted with a Grignard reagent of the formula
and the resulting compound of the formula
is cyclized in the presence of a base.
Compound I in turn may be readily converted by known methods to valuable steroids.
Disclosed as a mixed anhydride steroid intermediate of formula III is 7aβ-methyl-2,3,3aα, 4, 5, 6, 7; 7a-octahydro-1H-inden-1,5-dione-4a-(3-propionic acid) pivalic acid mixed anhydride.)
(一种制备式类固醇中间体的工艺
其中将特戊酰氯加入式化合物中
生成的式化合物
与式中的格氏试剂反应
生成的式化合物
在碱存在下环化。
化合物 I 又可以通过已知的方法很容易地转化为有价值的类固醇。
作为式 III 混合酸酐类固醇中间体公开的是 7aβ-甲基-2,3,3aα, 4, 5, 6, 7; 7a-八氢-1H-茚-1,5-二酮-4a-(3-丙酸)新戊酸混合酸酐)。