5-dihydroxy-7-methoxy-2,3,6,9-tetrahydro-1H-cyclopenta[a] naphthalene (2a) in high yield. The latter has been transformed into the title C-aromatic steroid (7a) through steps involving methylation, hydrolysis, C-methylation, and Robinson annulation. The analogous synthesis of 11,17ξ-dimethoxygona-4,8,11,13-tetraen-3-one (7b) is also described.
5-羟基-7-甲氧基-1 H-环戊[ a ]
萘-3(2 H)-一(1)的桦木还原得到3,5-二羟基-7-甲氧基-2,3,6,9-四氢-1 H-环戊[ a ]
萘(2a),高收率。后者已通过涉及甲基化,
水解,C-甲基化和罗宾逊环化的步骤转化为标题C-芳族类
固醇(7a)。还描述了11,17ξ-二甲氧基gona-4,8,11,13-四烯-3-酮(7b)的类似合成。