quantitatively the desired heterocyclized pyridazino[6,1­ c]pyrimido[5,4­e][1,2,4]triazine derivative as a novel heterocyclic system. Eventually, the reaction of it with various secondary amines obtained new derivatives of pyridazino[6,1­c]pyrimido[5,4­ e][1...

Several derivatives of the novel pyridazino[6,1-c]pyrimido[5,4-e][1,2,4]triazine ring system have been synthesised through heterocyclisation of 5-bromo-2,4-dichloro-6-methylpyrimidine with 3-chloro-6-hydrazinylpyridazine followed by treatment...