[(1R,2R,6R,8R,12S,13R,14S,16S,17R)-16-acetyloxy-4,4,9,9,13-pentamethyl-18-methylidene-19-oxo-3,5-dioxapentacyclo[12.5.0.01,6.02,17.08,13]nonadecan-12-yl] acetate 在
盐酸 作用下,
以
四氢呋喃 、
甲醇 为溶剂,
以93%的产率得到[(1R,2R,4R,8S,9R,10S,12S,13S,16R)-12-acetyloxy-2,16-dihydroxy-5,5,9-trimethyl-14-methylidene-15-oxo-8-tetracyclo[11.2.1.01,10.04,9]hexadecanyl] acetate