15β,16β-methylene-3-methoxy-spiro[androsta-3,5-diene-17β2'-oxirane] 、
sodium ethanolate 、
丙二酸二乙酯 以
乙醇 为溶剂,
反应 8.5h,
生成 17-hydroxy-15β,16β-methylene-3-methoxy-17α-pregna-3,5-diene-21,21-dicarboxyIic acid ethyl ester γ-lactone 、 17-hydroxy-15β,16β-methylene-3-methoxy-17α-pregna-3,5-diene-21,21-dicarboxyIic acid ethyl ester γ-lactone