甲基 12alpha-羟基-3-氧代-5beta-胆烷-24-酸酯 、
对甲苯磺酰肼 以
溶剂黄146 为溶剂,
反应 12.0h,
以75%的产率得到methyl (4R)-4-[(5R,8R,9S,10S,12S,13R,14S,17R)-12-hydroxy-10,13-dimethyl-3-[(4-methylphenyl)sulfonylhydrazinylidene]-1,2,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthren-17-yl]pentanoate