acetate 10b by β-mode oxirane opening to 10a, followed by epimerization at C-4. Reactions of A/Bcis-α,β-epoxyketones 1a and 1c in acetone containing aqueous hydrogen chloride resulted in α-mode regiospecific oxirane opening, followed by β-dehydration to 4-chloro-4-en-3-ones 4a and 4c. Reaction of hydrogen chloride in "10%" ethanol–chloroform with 4β,5β-epoxy-17β-hydroxyandrostan-3-one 1a gave non-regioselectively
A/Bcis-4β,5β-epoxy-17β-hydroxyandrostan-3-one acetate 1b 与
氟化氢在
氯仿中反应得到 5α-fluoro-4α,17β-dihydroxyandrostan-3-one acetate 10b,由 β-mode oxirane 打开10a,然后在 C-4 处进行差向异构化。A/Bcis-α,β-环氧酮 1a 和 1c 在含有
氯化氢水溶液的
丙酮中的反应导致 α-模式区域特异性
环氧乙烷开环,然后β-脱
水生成 4-
氯-4-en-3-酮 4a 和 4c。
氯化氢在“10%”
乙醇-
氯仿中与 4β,5β-epoxy-17β-hydroxyandrostan-3-one 1a 反应得到非区域选择性 3a 和 4a (α:α'1:1),而与 4α 反应, 5α-epoxy-17β-hydroxyandrostan-3-one acetate 2, 1α,