Acetic acid (5S,10S,13S,14S,17S)-10,13-dimethyl-3,11-dioxo-2,3,4,5,6,7,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl ester 在
lead(IV) acetate 、
aluminum oxide 作用下,
以
二氯甲烷 为溶剂,
生成
Acetic acid (1S,3aR,4aS,5aS,9aS,9bR,11aS)-9b-hydroxy-9a,11a-dimethyl-4,7,10-trioxo-hexadecahydro-benzo[a]cyclopenta[f]azulen-1-yl ester