Biomimetic total synthesis of steroids IV. Stereoselective synthesis of 15α-methyl-19-norsteroids
作者:M.B. Groen、F.J. Zeelen
DOI:10.1002/recl.19790980418
日期:——
hexenyl]-3,5-dimethyl-2-cyclopentenol (3) was investigated. Exclusive formation of 1- and 3-methoxy-15α,17-dimethyl-1,3,5(10), 13(17)-gonatetraene (4 and 5) was observed, indicating complete stereoselectivity in the cyclization process. Compound 4 was converted into dl-15α-methylestrone methyl ether (7) and hence into dl-15α-methylestradiol 3-methyl ether (8). The structure of these hitherto unknown
的2- [6-(阳离子环化米- (甲氧基苯基)Ë -3,5-二甲基-2-环戊烯醇()-3-己烯基〕3)进行了研究。观察到1-和3-甲氧基-15α,17-二甲基-1,3,5(10),13(17)-邻苯二甲酸二烯(4和5)的排他性形成,表明在环化过程中完全立体选择性。将化合物4转化为dl-15α-甲基雌酮甲基醚(7),因此转化为dl-15α-甲基雌二醇3-甲基醚(8)。这些迄今未知的化合物的结构通过独立的合成证明。