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Novel 1,3,10,12-tetrasubstituted-8H-pyrido(2',3':4,5)pyrimido(6,1-b)quinazolin-8-ones were synthesised by a Niementowski reaction involving condensation of substituted anthranilic acids with a 5,7-disubstituted-3H-pyrido(2,3-d)pyrimidin-4-ones. Microwave irradiation in polyphosphoric acid media was used in order to improve reactions where classical or direct fusion method was limited. The synthesis of title compounds highlights a comparative study of the classical, microwave technique and direct fusion methods.

Efficient Niementowski synthesis of novel 1,3,10,12-tetra-substituted-8H-pyrido[2',3':4,5]pyrimido[6,1-b]quinazolin-8-ones