Acetic acid (3S,4aR,6aR,6bS,8aS,11S,14aR,14bS)-11-chlorocarbonyl-4,4,6a,6b,8a,11,14b-heptamethyl-14-oxo-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,10,11,12,12a,14,14a,14b-icosahydro-picen-3-yl ester 在
ammonium hydroxide 作用下,
以
环己烷 、
苯 为溶剂,
反应 0.17h,
生成
(3β,18β)-3-acetoxy-18-hydroxy-11-oxoolean-12-en-30-oic acid-30,18-lactone