Inhibitors of sterol synthesis. An efficient and specific side chain oxidation of 3β-hydroxy-5α-cholest-8(14)-en-15-one. Facile access to its metabolites and analogs.
作者:Josef E. Herz、Shankar Swaminathan、William K. Wilson、George J. Schroepfer
DOI:10.1016/0040-4039(91)80590-3
日期:1991.8
3β-hydroxy-5α-cholest-8(14)-en-15-one (1), a potent regulator of cholesterol metabolism, with a mixture of trifluoroacetic anthydride, hydrogen peroxide, and sulfuric acid at ∼−2°C for 3.5 h gave remarkably high yields (∼64%) of a mixture of C24 oxygenated products: 3β-acetoxy-24-trifluoroacetoxy-5α-chol-8(14)-en-15-one (6), 3β-acetoxy-24-hydroxy-5α-chol-8(14)-en-15-one (7), and 3β,24-diacetoxy-5α-chol-8(14)-en-15-one
用三氟乙酸酐,过氧化氢和硫酸在〜-的混合物处理3β-羟基-5α-胆甾8(14)-en-15-one(1)的乙酸盐,这是一种有效的胆固醇代谢调节剂在2°C下放置3.5小时,C 24氧化产物混合物的收率非常高(〜64%):3β-乙酰氧基-24-三氟乙酰氧基-5α-chol-8(14)-en-15-one(6), 3β-乙酰氧基-24-羟基-5α-chol-8(14)-en-15-one(7)和3β,24-二乙酰氧基-5α-chol-8(14)-en-15-one(8) 。粗反应产物中6的三氟乙酰氧基官能团的选择性水解得到的7和8的分离产率分别为61%和3%。7的可用性,在C-3选择性保护,提供了潜在的代谢产物和1类似物的合成的关键中间体。因此,7被容易地转化为3β羟基-15-酮5α-CHOL-8(14) -烯-24-酸(4)和的25氮杂类似物1,3β羟基-24二甲基氨基- 5α-chol-8(14)-en-15-一(10)。