9,10-di-tert-butyldimethylsilyloxystearic acid 、
3β-hydroxy-7β-tert-butyldimethylsilyloxystigma-5-ene 在
4-二甲氨基吡啶 、
N,N'-二环己基碳二亚胺 作用下,
以
二氯甲烷 为溶剂,
反应 24.0h,
以90%的产率得到(3S,7R,8S,9S,10R,13R,14S,17R)-7-((tert-butyldimethylsilyl)oxy)-17-((2R,5R)-5-ethyl-6-methylheptan-2-yl)-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl 9,10-bis((tert-butyldimethylsilyl)oxy)octadecanoate