作者:T. Komeno、M. Kishi、H. Watanabe、K. Tori
DOI:10.1016/0040-4020(72)80113-3
日期:1972.1
Oxidation of 3-substituted 5α-cholestan-2α,5-episulphides (4a, 4b, 5, 6a, 6b, 10a, and 10b) with m-chloroperbenzoic acid afforded the corresponding anti-sulphoxides (7a, 7b, 8, 9a, 9b, 11a, and 11b, respectively). Sulphinyl configurations have been assigned from chemical evidence and established by dipole-moments and NMR spectroscopy, 3β-Bromo-anti-sulphoxide 11a with phenyl lithium was found to give
的3-取代的5α-胆甾烷2α,5- episulphides(氧化4A,4B,5,图6a,图6b,图10A和10B)与米,得到相应的氯过苯甲酸抗-sulphoxides(图7a,图7b,8,图9a,分别为9b,11a和11b)。从化学证据中已确定了亚磺酰基构型,并通过偶极矩和NMR光谱确定了3β-溴-抗亚砜11a发现与苯基锂反应得到胆甾醇-2,4-二烯。讨论了一种机理,该机理涉及形成5-(S)-苯基亚磺酰基-5α-胆甾-2-烯作为起始中间体,然后通过环状分子内机理进行顺式消除。讨论了各向异性屏蔽效应和苯引入的S→O键引起的溶剂转移。