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US6121449A Process for preparing carboxamido-4-azasteroids 失效
制备甲酰氨基-4-氮杂甾体的方法

Process for preparing carboxamido-4-azasteroids
摘要:
A process for producing a compound of formula (I): ##STR1## wherein the dotted lines - - - independently represent a single or double bond and R, R.sub.1, R.sub.2 and R.sub.3 are each hydrogen or an organic radical, comprises treating the corresponding 17.beta.-carbonylimidazole intermediates with anhydrous acids in the presence of an amine and, optionally, hydrogenating the resulting compound.
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