17β-Chloro- and 17β-iodo-16α,17α-epoxy-5α-androstane are reactive compounds which undergo ready rearrangement into 16-halogeno-17-ketones. On treatment with aluminium chloride the chloro-epoxide undergoes methyl group migration, to give 17-methyl-18-nor-5α-androst-13(17)-en-16-one in 82% yield. The iodo-epoxide, which is unstable, is best obtained (22% yield) by oxidising 17-iodo-5α-androst-16-ene
17β-
氯-和17β-
碘-16α,17α-环氧-5α-
雄甾烷是反应性化合物,它们容易重新排列为16-卤素-17-酮。用
氯化铝处理后,
氯代环氧化合物发生甲基迁移,以82%的收率得到17-甲基-18-nor-5α-androst-13(17)-en-16-one。通过在苯中用过氧
月桂酸氧化17-
碘5α-雄甾16-烯可以最好地获得不稳定的
碘化
环氧化物(22%的收率)。