methyl 3-hydroxy-5-methoxy-4-{[(1aRS,3aS,4R,7aS,7bSR)-4,5,7a,7b-tetramethyldecahydronaphtho[2,1]oxiren-4-yl]methyl}benzoate                                                                                                                                                              在
                                                                                                                                                                                 
三氟化硼乙醚                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以75%的产率得到(3R,4aS,7S,7aR,13aS)-methyl 3-hydroxy-9-methoxy-4,4,7,7a-tetramethyl-1,2,3,4,4a,5,6,7,7a,8-decahydrobenzo[d]xanthene-11-carboxylate