(3S,5R,7R,8R,9S,10S,13R,14S,17R)-17-[(R)-4-(tert-Butyl-dimethyl-silanyloxy)-1,5-dimethyl-hexyl]-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthrene-3,7-diol 在
环己酮 、 aluminum tri-tert-butoxide 作用下,
以
甲苯 为溶剂,
反应 20.0h,
以59%的产率得到(5S,7R,8R,9S,10S,13R,14S,17R)-17-[(2R)-5-[tert-butyl(dimethyl)silyl]oxy-6-methylheptan-2-yl]-7-hydroxy-10,13-dimethyl-1,2,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthren-3-one