乙酸酐 、 (1S,4S,5R,6R,7R)-4-Acetoxy-1-((4S,5R)-4-acetoxy-5-methyl-3-methylene-6-phenyl-hexyl)-6-((E)-(4S,6S)-4,6-dimethyl-oct-2-enoyloxy)-7-hydroxy-2,8-dioxa-bicyclo[3.2.1]octane-4,5-dicarboxylic acid dimethyl ester 在
三氟甲磺酸三甲基硅酯 作用下,
反应 0.08h,
以95%的产率得到(1S,4S,5R,6R,7R)-4,7-Diacetoxy-1-((4S,5R)-4-acetoxy-5-methyl-3-methylene-6-phenyl-hexyl)-6-((E)-(4S,6S)-4,6-dimethyl-oct-2-enoyloxy)-2,8-dioxa-bicyclo[3.2.1]octane-4,5-dicarboxylic acid dimethyl ester