The present invention provides 4-nitro-.DELTA..sup.4 -3-ketosteroids, their use as steroid C.sub.17-20 lyase and 5.alpha.-reductase inhibitors and to a novel process for preparing a compound of the formula: ##STR1## comprising sequentially: a) reacting a starting compound of the formula ##STR2## with an effective amount of a strong base at an elevated or suitable temperature for a time sufficient to create the corresponding thermodynamic dienolate, followed by addition of a neutral nitrating agent to produce the 4-nitro-steroid; and then; b) reacting the 4-nitrosteroid with a suitable reducing agent.
本发明提供了4-硝基-.DELTA..sup.4-3-
酮类固醇,其作为类
固醇C.sub.17-20裂解酶和5α-还原酶
抑制剂的用途,以及用于制备以下化合物的新方法:##STR1## 包括依次进行:a)将具有以下结构的起始化合物##STR2## 与有效量的强碱在升高或适当的温度下反应足够时间以生成相应的热力学二烯醇负离子,然后加入中性硝化试剂以产生4-硝基类
固醇;然后;b)将4-硝基类
固醇与适当的还原剂反应。