Novel simple syntheses of 7-(O-carboxymethyloxime) derivatives of 3β-hydroxyandrost-5-en-17-one (dehydroepiandrosterone) and of 3β-hydroxypregn-5-en-20-one (pregnenolone) are reported. In the first one, 17-oxoandrost-5-en-3β-yl acetate was oxidized to give the 7,17-dione which was then selectively reduced in the position 17. Oximation, reoxidation, and deacetylation yielded the desired oxime. The second synthesis started with (20R)-pregn-5-ene-3β,20-diol 3-acetate which was converted to the 20-nitrate, oxidized to the C-7 ketone, oximated, partially deprotected in position 20, reoxidized, and deacetylated. Both the 7-(O-carboxymethyloxime) derivatives have been devised as immunoassay components.
新颖的简单合成方法报道了3β-羟基雄烯-5-烯-17-酮(
去氢表雄酮)和3β-羟基孕烯-5-烯-20-酮(
孕酮)的7-(
O-羧甲氧基
肟)衍
生物。在第一种合成方法中,17-氧代雄烯-5-烯-3β-基
乙酸酯被氧化得到7,17-二酮,然后在17位选择性还原。羟
肟化、再氧化和去乙酰化得到了期望的
肟化合物。第二种合成方法以(20
R)-孕-5-烯-3β,20
-二醇-3-
乙酸酯为起始物,将其转化为20-
硝酸酯,氧化为C-7酮,羟
肟化,部分去保护20位,再氧化和去乙酰化。这两种7-(
O-羧甲氧基
肟)衍
生物被设计为免疫分析组分。