1,2,4-Triazines with electron-withdrawing substituents at the three position react with cyclo-octa-1,5-diene by intermolecular Diels–Alder addition followed by elimination of nitrogen; the 2-azadiene so formed then undergoes an intramolecular Diels–Alder reaction producing novel cage compounds.
                                    1,2,4-三嗪在三个位置具有吸电子取代基,通过分子间狄尔斯-阿尔德加成反应与环
辛-1,5-二烯反应,然后消除氮原子;如此形成的2-氮杂二烯随后进行分子内Diels-Alder反应,生成新的笼状化合物。