作者:T. Komeno、S. Ishihara、H. Itani
DOI:10.1016/0040-4020(72)88080-3
日期:1972.1
Michael addition of 12a, 12b and 21b to methyl vinyl ketone led to the corresponding adducts with configurationally retained sulfonyl groups which were converted to 10β-methylsulfonyl and 10β-phenyl-sulfonyl steroids 27a, 27b and 27c respectively. On the other hand, reaction of 21b with methyl α-bromoacetate yielded 29, desulfurization of which gave 30 identical with the product of alkylation of the enamine
标题化合物,12A,12 b,21一和21B,通过用二缩酮从二甲砜或苯基甲基砜生成的α-磺酰基负碳离子反应合成9甲基-7a-甲基-1,5-二氧代3α通过5的发酵和随后产物的氧化制备7,α-六氢茚满-4α-丙酸丙酸酯。缩酮21a和21b的脱硫得到des-A-类固醇3a。迈克尔加成12a,12b和21b甲基乙烯基酮的二甲基苯甲酸酯生成具有构型保留的磺酰基的相应加合物,其分别转化为10β-甲基磺酰基和10β-苯基磺酰基甾族化合物27a,27b和27c。另一方面,21b与α-溴乙酸甲酯的反应产生29,其脱硫得到与3a的烯胺28的烷基化产物相同的30。从30制备A-呋喃类固醇1a和37a及其1-甲基衍生物。通过PMR和CD光谱数据证明了化合物中磺酰基的β轴构型。