It was found that the reaction of lead tetraacetate with 3β-hydroxy steroids of the 5α-series gave the corresponding 3β, 19-oxido steroids. Only poor yields were obtained in the cases of 3β-hydroxy steroids having no substituent at C-5 (5α-H). Substitution at the 5α-position by an electronegative group such as halogen or acetoxyl enhanced the yield of the 3β, 19-oxido compound. The best result was obtained when a steroid was heated with lead tetraacetate in benzene in the presence of calcium carbonate and a trace of benzoyl peroxide.
发现四
乙酸铅与5α系列3β-羟基
甾体化合物的反应产生了相应的3β, 19-氧代
甾体化合物。在没有C-5(5α-H)取代基的3β-羟基
甾体化合物的情况下,仅得到了较低的产率。通过在5α位引入电负性基团如卤素或乙酰氧基能提高3β, 19-氧代化合物的产率。当
甾体化合物在
碳酸钙和微量
过氧化苯甲酰存在下,与四
乙酸铅在苯中加热时,得到了最佳结果。