from 3β-acetoxy- and 3β-hydroxyandrost-5-ene-17β-carbaldehydes. For the synthesis of analogous Δ16-17-oxadiazolyl derivatives, N,N′-disubstituted hydrazine intermediates were prepared from 3β-acetoxyandrosta-5,16-diene-17-carboxylic acid, which then underwent cyclodehydration in the presence of POCl3. The cyclization of steroidal N,N′-diacylhydrazines containing a saturated ring D with the Lawesson reagent
一系列新颖的17-外-oxadiazoles在Δ和-thiadiazoles 5雄甾烯系列被有效地从
孕烯醇酮乙酸酯合成并pregnadienolone
乙酸通过多步途径。17 β - (1',3',4') -恶二唑,通过缩
氨基
脲的苯基
碘二
乙酸盐诱导的氧化环合以高产率获得,并且Ñ -acylhydrazones从3衍生的β乙酰氧基-和3- β -hydroxyandrost -5-烯- 17 β -carbaldehydes。对于类似的Δ的合成16 -17恶二唑基衍
生物,Ñ,ñ从3制备“二取代的
肼中间体β-乙酰氧基雄烷-5,16-二烯-17-
羧酸,然后在POCl 3存在下进行环脱
水。的甾体的环化Ñ,Ñ '含有与劳森的饱和环d -diacylhydrazines试剂,得到17 β - (1',3',4') -以良好的收率
噻二唑。为了扩大可用于药理研究的化合物库,大多数产品都在碱性介质中进行了脱乙