Synthesis of New Derivatives of Pyridazino[6,1-c]pyrimido[5,4-e][1,2,4]triazine; a Novel Heterocyclic System.

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...