(2S,3S,3aR,4aR,5aR,6R,9aS,9bR)-3-Hydroxy-2-isobutyryl-6,9a-dimethyl-dodecahydro-4-oxa-cyclopenta[a]cyclopropa[b]naphthalene-6-carboxylic acid methyl ester 在
4-二甲氨基吡啶 、
三乙胺 、
三氟乙酸酐 作用下,
以
二氯甲烷 为溶剂,
反应 24.0h,
以58%的产率得到(3aS,4aR,5aR,6R,9aS,9bR)-2-Isobutyryl-6,9a-dimethyl-1,4a,5,5a,6,7,8,9,9a,9b-decahydro-4-oxa-cyclopenta[a]cyclopropa[b]naphthalene-6-carboxylic acid methyl ester