中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
5-溴-6beta,19-环氧-5alpha-胆甾烷-3beta-醇乙酸酯 | 5-bromo-6β,19-epoxy-5α-cholestan-3β-ol acetate | 1258-07-7 | C29H47BrO3 | 523.594 |
—— | 5α-bromo-6-ketocholestan-3β-yl acetate | 14956-20-8 | C29H47BrO3 | 523.594 |
—— | 5-bromo-6β-fluoro-5α-cholestan-3β-ol acetate | 55106-05-3 | C29H48BrFO2 | 527.601 |
Syntheses of 5-hydroxy-5α- and 5β-cholestan-6-one (11 and 13) and their 3β-acetoxy (10 and 21) and 3β-benzyloxy derivatives (12 and 19) are described, as are syntheses of the 7α-deutero derivatives of 10 and 21. Related investigations of the syntheses of the 5-methoxy and 5-methyl analogues of these compounds are also discussed. Treatment of 12 with potassium tert-butoxide has been shown to give 5-hydroxy-5β-cholest-3-en-6-one (14) and its Δ2 isomer 15. Reaction of 6-nitrocholesteryl acetate (50) with lithium dimethylcuprate gives 3α,5-cyclo-5α-cholestan-6-one (E)-oxime (51) as the major product.