17α, 21-Dihydroxypregn-4-ene-3, 11, 20-trione 21-acetate and 5α-cholest-7-en-3β-ol acetate were treated with ozone to afford the corresponding 5β, 6β-and 7α, 8α-epoxide, respectively. 17α, 21-Dihydroxy-5α-pregn-9 (11)-ene-3, 20-dione 21-acetate gave 17α, 21-dihydroxy-9, 11-seco-5α-pregnane-3, 9, 20-trion-11-al 21-acetate on ozone oxidation, which was converted into 17α, 21-dihydroxy-9, 11-seco-5α-pregnane-3, 9, 20-trione-11-carboxylic acid 11, 17-lactone 21-acetate by oxidation with chromium trioxide.
用
臭氧处理 17α,21-二羟基-5α-孕甾-4-
烯-3,11,20-三
酮 2
1-乙酸
酯和 5α-胆甾
烯-7-
烯-3β-醇
乙酸酯,可分别得到相应的 5β,6β 和 7α,8α-
环氧化物。17α,21-二羟基-5α-孕甾-9 (11)-
烯-3,20-二
酮 2
1-乙酸
酯在
臭氧氧化作用下生成 17α,21-二羟基-9,11-seco-5α-孕甾-3,9,20-三
酮-11-醛 2
1-乙酸
酯、用
三氧化铬氧化后,转化为 17α,21-二羟基-9,11-seco-5α-孕甾-3,9,20-三
酮-11-
羧酸 11,17-内
酯 2
1-乙酸
酯。