(5R,8R,9S,10S,13S,14S)-17-(5,6-Dihydro-[1,4]dioxin-2-yl)-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-17-ol 在
4 A molecular sieve 、
pyridinium chlorochromate 作用下,
以
二氯甲烷 为溶剂,
反应 0.17h,
以56%的产率得到(5R,8R,9S,10S,13S,14S,17S)-17-Hydroxy-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthrene-17-carboxylic acid 2-formyloxy-ethyl ester