异烟酸 、 methyl 3α-(3-dimethoxyformylbenzoyloxy)-12α-hydroxy-5β-deoxycholan-24-oate 在
4-二甲氨基吡啶 、
盐酸-N-乙基-Nˊ-(3-二甲氨基丙基)碳二亚胺 作用下,
以
二氯甲烷 为溶剂,
以93%的产率得到[(3R,5R,8R,9S,10S,12S,13R,14S,17R)-3-[3-(dimethoxymethyl)benzoyl]oxy-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-12-yl] pyridine-4-carboxylate