From 17β-hydroxy-15β-[(4-methoxyphenyl)methoxy]androst-5-en-3β-yl acetate (1) by acetylation, removal of (4-methoxyphenyl)methyl group, and oxidation with Jones reagent, 15-oxoandrost-5-ene-3β,17β-diyl 3,17-diacetate (4) was prepared. (O-Carboxymethyl)hydroxylamine treatment and subsequent diazomethane methylation gave methyl ester of corresponding 15-(O-carboxymethyl)oxime derivative. Partial acid hydrolysis gave 3-acetate as a minor product, therefore the major 17-acetate was transformed in two steps into the 3-benzoate. Oxidation at position 17 and subsequent deprotection gave for both products final (15E)-3β-hydroxyandrost-5-ene-15,17-dione 15-(O-carboxymethyl)oxime (14), but for 3-acetyl derivative the whole synthesis is shorter and gave higher yield.
通过乙酰化、去除(4-甲氧苯基)甲基基团并使用Jones试剂氧化,制备了15-氧代雄甾-5-烯-3β,17β-二
乙酸酯(4)。通过(O-羧甲基)
羟胺处理和随后的重氮甲基化,得到相应的15-(O-羧甲基)
肟衍
生物的甲酯。部分酸
水解得到3-
乙酸酯作为副产物,因此主要的17-
乙酸酯经过两步转化为3-
苯甲酸酯。在17位处氧化和随后的去保护作用下,对于两种产物都得到了最终的(15E)-3β-羟基雄甾-5-烯-15,17-二酮15-(O-羧甲基)
肟(14),但对于3-乙酰基衍
生物,整个合成过程更短且产量更高。