申请人:Schering Aktiengesellschaft
公开号:US04708823A1
公开(公告)日:1987-11-24
Known pregnane derivatives are prepared by esterificiation of known androstane derivatives to give new ester of Formula III ##STR1## wherein in each case symbolizes a single bond or a double bond, n is 1 or 2, R.sub.1 is hydrogen or methyl, R.sub.2 is hydrogen or formyl, and R.sub.3 is chlorine, hydroxy or an alkanoyloxy group of up to 6 carbon atoms, and reaction of the latter with Ag(I) and formic acid.
已知的孕烷衍生物是通过将已知的雄烷衍生物酯化制备出新的化合物III的酯来制备的##STR1##其中在每种情况下,符号表示单键或双键,n为1或2,R.sub.1为氢或甲基,R.sub.2为氢或甲酰基,R.sub.3为氯、羟基或最多含有6个碳原子的烷酰氧基团,并与Ag(I)和甲酸反应。