苯甲酸酐 、 (3S,3aR,4S,6S,6aR,7S,8S,9bS)-4-(butyryloxy)-3,3a,6-trihydroxy-3,6,9-trimethyl-8-((Z)-2-methylbut-2-enoyloxy)-2-oxo-2,3,3a,4,5,6,6a,7,8,9b-decahydroazuleno[4,5-b]furan-7-yl octanoate 在
对甲苯磺酸 作用下,
以
二氯甲烷 为溶剂,
反应 240.0h,
以39%的产率得到(3S,3aR,4S,6S,6aR,7S,8S,9bS)-4-(butyryloxy)-3,3a-dihydroxy-3,6,9-trimethyl-8-((Z)-2-methylbut-2-enoyloxy)-7-(octanoyloxy)-2-oxo-2,3,3a,4,5,6,6a,7,8,9b-decahydroazuleno[4,5-b]furan-6-yl benzoate