lithocholic acid benzyl ester 、
间苯二酚 在
吡啶 作用下,
以
四氢呋喃 为溶剂,
反应 2.0h,
以32%的产率得到benzyl (4R)-4-[(3R,5R,8R,9S,10S,13R,14S,17R)-3-[3-[[(3R,5R,8R,9S,10S,13R,14S,17R)-10,13-dimethyl-17-[(2R)-5-oxo-5-phenylmethoxypentan-2-yl]-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl]oxycarbonyloxy]phenoxy]carbonyloxy-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