(3alpha,5beta)-3-[(乙氧羰基)氧基]-7-氧代-胆烷-24-酸甲酯 、
对甲苯磺酰肼 以
溶剂黄146 为溶剂,
反应 12.0h,
以76%的产率得到methyl (4R)-4-[(3R,5R,8R,9S,10S,13R,14S,17R)-3-ethoxycarbonyloxy-10,13-dimethyl-7-[(4-methylphenyl)sulfonylhydrazinylidene]-1,2,3,4,5,6,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthren-17-yl]pentanoate