(E)-2-Methyl-but-2-enoic acid (3S,3aR,4S,6S,6aS,9R,9aS,9bS)-3,6-diacetoxy-3,6,9-trimethyl-2,8-dioxo-dodecahydro-azuleno[4,5-b]furan-4-yl ester 在
sodium methylate 作用下,
以
甲醇 为溶剂,
反应 24.0h,
以83%的产率得到(E)-2-Methyl-but-2-enoic acid (3S,3aR,4S,6S,6aS,9R,9aS,9bS)-6-acetoxy-3-hydroxy-3,6,9-trimethyl-2,8-dioxo-dodecahydro-azuleno[4,5-b]furan-4-yl ester