、
(R)-4-((3R,5S,7R,8R,9S,10S,12S,13R,14S,17R)-3-Ethoxycarbonyloxy-12-hydroxy-10,13-dimethyl-7-trimethylsilanyloxy-hexadecahydro-cyclopenta[a]phenanthren-17-yl)-pentanoic acid methyl ester 在
三氟甲磺酸三甲基硅酯 作用下,
以
1,2-二氯乙烷 为溶剂,
反应 14.0h,
以10%的产率得到(R)-4-[(3R,5S,7R,8R,9S,10S,12S,13R,14S,17R)-3-Ethoxycarbonyloxy-12-hydroxy-10,13-dimethyl-7-((2S,3R,4S,5S,6R)-3,4,5-triacetoxy-6-acetoxymethyl-tetrahydro-pyran-2-yloxy)-hexadecahydro-cyclopenta[a]phenanthren-17-yl]-pentanoic acid methyl ester