3-Enol acetates of some 4-en-3-oxo-steroids were oxidized to the corresponding 7-ones with t-butyl chromate and 3-enol methyl ethers were to the corresponding 4-ene-3, 6-diones, 6β-hydroxy-4-en-3-ones or 4, 6-dien-3-ones according to the reaction conditions. 3-Enol methyl ethers were prepared with methyl orthoformate in dioxane by catalysis of p-toluenesulfonic acid. 17α-Acetoxy-5α, 6β-dichloropregnane-3, 20-dione was converted into 3-methoxy-6-chloro-17α-acetoxypregna-3, 5-dien-20-one in one step.
某些4-烯-3-氧代
甾体化合物的3-烯醇
乙酸酯被叔丁基
铬酸盐氧化成相应的7-位异构体,而3-烯醇
甲醚则在反应条件下转化为相应的4-烯-3,6-二酮、6β-羟基-4-烯-3-酮或4,6-二烯-3-酮。3-烯醇
甲醚是通过在
二噁烷中以
对甲苯磺酸为催化剂,使用
原甲酸三甲酯制备的。17α-乙酰氧基-5α,6β-二
氯孕甾烷-3,20-二酮在一歩反应中转化为3-甲氧基-6-
氯-17α-乙酰氧基孕甾-3,5-二烯-20-酮。