Acetic acid (3S,5R,7R,8R,9S,10S,12S,13R,14S,17R)-7,12-dihydroxy-10,13-dimethyl-17-((R)-1-methyl-4-trityloxy-butyl)-hexadecahydro-cyclopenta[a]phenanthren-3-yl ester 在
重铬酸吡啶 、 4 A molecular sieve 作用下,
以
二氯甲烷 为溶剂,
生成
Acetic acid (3S,5S,8R,9S,10S,13R,14S,17R)-10,13-dimethyl-17-((R)-1-methyl-4-trityloxy-butyl)-7,12-dioxo-hexadecahydro-cyclopenta[a]phenanthren-3-yl ester