diethyl 2-((2E,6E)-8-(2-hydroxyphenyl)-2,6-dimethylocta-2,6-dienyl)-2-(prop-2-ynyl)malonate                                                                                                                                                              在
                                                                                                                                                                                 silver hexafluoroantimonate   、                                                                                                  MeO-DTBM-BIPHEP(AuCl)2                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
间二甲苯                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 
diethyl (4aR,6aS,12aS,12bR)-6a,12b-dimethyl-4-methylene-1,3,4,4a,5,6,6a,12,12a,12b-decahydro-2H-benzo[a]xanthene-2,2(12bH)-dicarboxylate   、                                                                                             diethyl (4aS,6aR,12aR,12bS)-6a,12b-dimethyl-4-methylene-1,3,4,4a,5,6,6a,12,12a,12b-decahydro-2H-benzo[a]xanthene-2,2(12bH)-dicarboxylate