Acetic acid (R)-2-[(3R,5S,8S,9S,10S,11S,13S,14S,17R)-3-(tert-butyl-dimethyl-silanyloxy)-11,17-dihydroxy-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-17-yl]-2-hydroxy-ethyl ester 在
吡啶 、
pyridinium chlorochromate 作用下,
以
二氯甲烷 为溶剂,
反应 2.5h,
生成
5α-cortolone-20β 3-tert-butyldimethylsilyl ether 20,21-diacetate