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US4113680A Method for preparing 17 .alpha.-ester-21-halo pregnanes 失效
制备17 {60-二酯-2-卤代孕烷的方法

Method for preparing 17 .alpha.-ester-21-halo pregnanes
摘要:
One-step method for preparing 17 .alpha.-ester-21-halo pregnanes by reacting 17 .alpha., 21-cyclic orthoesters of 17 .alpha., 21-dihydroxy pregnanes with a halo compound in the presence of an organic polar solvent, simultaneously resulting in halogenation at 21-position and esterification at 17 .alpha.-position of said 17 .alpha., 21-cyclic orthoesters, the reaction proceeding in a short period of time without, or substantially without, any unfavorable side-reactions.
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