Practical routes to 9α-hydroxypregnenes were developed by epimerization and hydration of 17α-ethynyl-9α,17β-dihydroxyandrost-4-en-3-one. In the three different methods of epimerization which were used, the C-9α hydroxy group was not susceptible to rearrangement or other side reactions. C-21 functionalized 9α-hydroxypregnenes were obtained by introducing a 17α-halogenated ethynyl group into 9α-hydroxyandrost-4-ene-3
通过 17α-
乙炔基-9α,17β-dihydroxyandrost-4-en-3-one 的差向异构化和
水合开发了 9α-羟基孕烯的实用途径。在使用的三种不同的差向异构化方法中,C-9α 羟基不易发生重排或其他副反应。C-21 官能化 9α-羟基孕烯是通过将 17α-卤代
乙炔基引入 9α-羟基
雄酮-4-烯-3,17-二酮中获得的。17β-硝基氧法的差向异构化和
水合产生21-卤代9α-羟基孕烯,其进一步转化为21-乙酰氧基-9α-羟基孕-4-烯-3,20-二酮。