[(3aR,4R,9aS,9bR)-6-methyl-2-oxo-3a,4,5,7,8,9,9a,9b-octahydro-3H-azuleno[4,5-b]furan-4-yl] acetate                                                                                                                                                              在
                                                                                                                                                                                 
bismuth(lll) trifluoromethanesulfonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 48.0h,
                                                                                                                以78%的产率得到(3aS,4R,9aS,9bS)-6-methyl-2-oxo-2,3,3a,4,5,7,8,9,9a,9b-decahydrobenzo[de]chromen-4-yl acetate