Synthetic steroids. Part X. Preparation of (3S)- and (3R)-spiro-[5α-cholestane-3,2′-oxiran] and their corresponding 2α-methyl and 2,2-dimethyl analogues
作者:J. D. Ballantine、P. J. Sykes
DOI:10.1039/j39700000731
日期:——
The preparation is reported of the 3R- and 3S-forms of spiro-[5α-cholestane-3,2′-oxiran] and their 2α-methyl and 2,2-dimethyl derivatives. The six epoxides were synthesised by addition of methylene to the relevant 3-ketone with either dimethylsulphoxonium methylide or dimethylsulphonium methylide, or by peroxidation of the corresponding 3-methylene-steroid with either m-chloroperoxybenzoic acid or
报道了螺-[5α-胆甾烷-3,2'-环氧乙烷]的3 R-和3 S-形式及其2α-甲基和2,2-二甲基衍生物的制备方法。六环氧化物通过添加亚甲基的合成有关的3-酮与任一dimethylsulphoxonium甲基氧或dimethylsulphonium甲基氧,或由相应的3-亚甲基甾类与任一的过氧化米氯过氧酸或peroxybenzimidic酸。