发明授权
US5384419A Preparation process for 20-keto-21(S) hydroxy steroid compounds and intermediates 失效
20-酮-21(S)羟基类固醇化合物和中间体的制备方法

Preparation process for 20-keto-21(S) hydroxy steroid compounds and
intermediates
摘要:
An improved process for the preparation of 20-keto-21(S)-hydroxy steroids of the Formula ##STR1## wherein R.sub.1 is alkyl of 1 to 3 carbon atoms, R.sub.2 is alkyl of 1 to 12 carbon atoms, and R.sub.3 is alkyl of 1 to 4 carbon atoms and novel intermediates therefrom.
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