3β, 5-Dihydroxy-6β-formyl-B-nor-5β-steroids (IIIa, b, c) of cholestane, pregnane, and androstane series were converted into the corresponding 3β, 5-dihydroxy-6β-methyl-B-nor-5β-steroids (VIa, d, e) by reduction of (III) with sodium borohydride, followed by tosylation of 6-hydroxymethyl group and subsequent treatment with lithium aluminium hydride. The compounds (VI) were oxidized to 3-oxo-5-hydroxy-6β-methyl-B-nor-5β-steroid derivatives (VIIa, b, f) which were then dehydrated to 6ξ-methyl-B-norcholest-4-en-3-one (VIIIa), 6ξ-methyl-B-norpregn-4-ene-3, 20-dione (VIIIb), and 6ξ-methyl-B-norandrost-4-ene-3, 17-dione (VIIIf).
将胆甾烷、孕烷和
雄甾烷系列的 3β,5-二羟基-6β-甲酰基-B-去甲-5β-类
固醇(IIIa,b,c)用
硼氢化钠还原(III),然后对 6-羟甲基进行
甲苯磺酰化,再用
氢化铝锂处理,转化成相应的 3β,5-二羟基-6β-甲基-B-去甲-5β-类
固醇(VIa,d,e)。化合物(VI)被氧化成 3-氧代-5-羟基-6β-甲基-B-去甲-5β-类
固醇衍
生物(VIIa、b、f),然后脱
水成 6ξ-甲基-B-去甲胆甾烷-4-烯-3-酮(VIIIa)、6ξ-甲基-B-去甲孕甾-4-烯-3,20-二酮(VIIIb)和 6ξ-甲基-B-去甲雄甾-4-烯-3,17-二酮(VIIIf)。