The synthesis of seven mesomeric triazaphenalene betaines 4a-g by condensation reaction of hexahydro-2H-pyrimido[1,2-a]pyrimidine 1 with diethyl malonates 2a-g or with bis(2,4,6-trichlorophenyl)malonates 3c,f has been achieved. The guanidine 1 forms in benzene solution a salt with trimethyl methanetricarboxylate 5 which upon heating produces 4a.
通过六氢-2 H-嘧啶基[1,2- a ]嘧啶1与丙二酸二乙酯2a-g或与双(2,4,6-三氯苯基)丙二酸酯3c的缩合反应合成7个三聚体的三氮杂苯并茂的甜菜碱4a-g f已实现。胍1在苯溶液中与三羧酸三甲酯5形成盐,加热后生成4a。