1,2,4,5-四嗪-3,6-二羧酸二甲酯   、                                                                                      
syn-12-Methoxytetracyclo<4.4.3.03,11.08,13>trideca-4,9-dien-exo-2,endo-7-dicarbonsaeure-dimethylester                                                                                                                                                                                              以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 5.0h,
                                                                                                                以3%的产率得到rac-tetramethyl (4aR,4bR,5R,5aS,8R,8aS,9S,9aR,10S,11R)-9-methoxy-2,4a,4b,5,5a,8,8a,9,9a,10-decahydro-8,10-methano-s-indaceno[1,2-d]pyridazine-1,4,5,11-tetracarboxylate