Isobutyric acid (3S,3aR,4R,6R,9bS)-6-hydroxy-3,6,9-trimethyl-2,8-dioxo-2,3,3a,4,5,6,7,8,9,9b-decahydro-azuleno[4,5-b]furan-4-yl ester 在
silica gel 作用下,
以
甲醇 、
二氯甲烷 为溶剂,
反应 48.0h,
以3 mg的产率得到Isobutyric acid (3S,3aR,4R,6R,6aS,9bS)-6-hydroxy-3,6,9-trimethyl-2,8-dioxo-2,3,3a,4,5,6,6a,7,8,9b-decahydro-azuleno[4,5-b]furan-4-yl ester