乙酸酐 、
(3aS,5R,5aS,6R,9aR,9bS)-6-Hydroxy-2,3a-dimethoxy-5-methyl-1-methylene-1,2,3a,4,5,5a,6,7,9a,9b-decahydro-naphtho[2,1-b]furan-8-carboxylic acid methyl ester 在
吡啶 、
4-二甲氨基吡啶 作用下,
反应 3.0h,
以98%的产率得到(3aS,5R,5aS,6R,9aR,9bS)-6-Acetoxy-2,3a-dimethoxy-5-methyl-1-methylene-1,2,3a,4,5,5a,6,7,9a,9b-decahydro-naphtho[2,1-b]furan-8-carboxylic acid methyl ester