(3aR,4S,8S,9S,9aS,9bR)-8-hydroxy-6,9-dimethyl-2-oxo-2,3,3a,4,5,7,8,9,9a,9b-decahydroazuleno[4,5-b]furan-4-yl acetate 在
bismuth(lll) trifluoromethanesulfonate 作用下,
以
二氯甲烷 为溶剂,
反应 72.0h,
以75%的产率得到(3aS,4S,8S,9R,9aR,9bs)-8-hydroxy-6,9-dimethyl-2-oxo-2,3,3a,4,5,7,8,9,9a,9b-decahydrobenzo[de]chromen-4-yl acetate