[(1S,3S,4S,5S,7S,8S,10S,11S,13S)-4-(acetyloxymethyl)-4,5,7,10,13-pentahydroxy-8,15,15-trimethyl-12-methylidene-2,9-dioxo-1-tricyclo[9.3.1.03,8]pentadecanyl] benzoate 、
乙酸酐 在
吡啶 、
4-二甲氨基吡啶 作用下,
以
二氯甲烷 为溶剂,
反应 2.0h,
以49%的产率得到[(1S,3S,4S,5S,7S,8S,10S,11S,13S)-5,7,10,13-tetraacetyloxy-4-(acetyloxymethyl)-4-hydroxy-8,15,15-trimethyl-12-methylidene-2,9-dioxo-1-tricyclo[9.3.1.03,8]pentadecanyl] benzoate