strongly on the electronic features of the substituents. Oppenauer oxidation of 3beta-hydroxy-17beta-exo-heterocyclic steroids 5a-e and 6a-e yielded the corresponding Delta(4)-3-ketosteroids 9a-e and 10a-e. The inhibitory effects (IC(50)) of these compounds on rat testicular C(17,20)-lyase were investigated by means of an in vitro radioligand incubation technique.
3β-羟基-21-
羟基亚甲基戊烯-5-烯-3β-醇-20-一(1)与苯
肼(2a)的反应提供了两种区域异构体,17β-(1-苯基-3-
吡唑基)androst-3-en -3beta-ol(5a)和17beta-(1-phenyl-5-pyrazolyl)androst-5-en-3beta-ol(6a)。1与对位取代的苯
肼(2b-e)的闭环反应方向在很大程度上取决于取代基的电子特征。3β-羟基-17β-外杂环类
固醇5a-e和6a-e的Oppenauer氧化产生了相应的Delta(4)-3-
酮类固醇9a-e和10a-e。通过体外放射性
配体孵育技术研究了这些化合物对大鼠睾丸C(17,20)-裂解酶的抑制作用(IC(50))。