(9R,13R)-4,5,17,18-tetramethoxy-12,12-dimethyl-11-oxatetracyclo[13.4.0.02,7.09,13]nonadeca-1(19),2,4,6,15,17-hexaen-10-one   、                                                                                      
甲基溴化镁                                                                                                                                                                                              以
                                                                                         
四氢呋喃   、                                                                                         
乙醚                                                                                  为溶剂,
                                                                                                                                                    反应 20.0h,
                                                                                                                以84%的产率得到(9R,10S,13R)-4,5,17,18-tetramethoxy-10,12,12-trimethyl-11-oxatetracyclo[13.4.0.02,7.09,13]nonadeca-1(19),2,4,6,15,17-hexaen-10-ol