Imidazopyrimidodiazepines--new heterocyclic system; synthesis and properties

The synthesis of the new tricyclic system ring 6-methyl-2,3,10,11-tetrahydroimidazo (1',2',3'-CD) pyrimido (5,4-b) (1,4) diazepinediones-5,8 is described. The 4-aryl- and 5-amino-imidazopyrimidodiazepines have also been obtained. The synthesis started from derivatives of 2-hydroxy-6-methyl-5-pyrimidine carboxylic acids. Some of the chemical and biological properties of new compounds are described.