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从薯蓣皂素配基出发,合成了C_(6a)-甲基化合物(Ⅷ).(Ⅷ)(R=Ac)用氯化亚硫酰或氧氯化磷处理,生成α-环氧化物(Ⅸ).
Starting from diosgenin, C_ (6a) -methyl compound (VIII) is synthesized. (Ⅷ) (R = Ac) is treated with thionyl chloride or phosphorus oxychloride to form α-epoxide Ⅸ).