methyl 3α-chlorocarbonyloxy-7α,12α-diacetoxy-5β-cholan-24-oate 、
对苯二胺 在
4-二甲氨基吡啶 作用下,
以
四氢呋喃 为溶剂,
反应 2.0h,
以95%的产率得到methyl (4R)-4-[(3R,5S,7R,8R,9S,10S,12S,13R,14S,17R)-7,12-diacetyloxy-3-[[4-[[(3R,5S,7R,8R,9S,10S,12S,13R,14S,17R)-7,12-diacetyloxy-17-[(2R)-5-methoxy-5-oxopentan-2-yl]-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl]oxycarbonylamino]phenyl]carbamoyloxy]-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoate