Derivatives of imidazo-sym-triazine

2-Dimethylamino-4,6,7,8-tetrahydroimidazo[1,2-a]-sym-triazin-4-one synthesized by us previously is converted by the action of aryl isocyanates and arenesulfonyl chlorides into the corresponding derivatives of urea and N-arenesulfonyl-substituted imidazo-sym-triazinones. It was shown that 6-(2-chloroethoxy)-2-dimethylamino-4-(methoxycarbonylmethylamino)-sym-triazine is converted by thermolysis into 2-dimethylamino-8-methoxycarbonylmethyl-4,6,7,8-tetrahydroimidazo[1,2-a]-1,3,5-triazin-4-one, which is also obtained by the action of methyl bromoacetate on the imidazo-sym-triazinone.