Fused/isolated heterocyclic of pyrimidine -lactam, thiazolidine and triazine derivatives incorporating benzpyrimidine derivatives have been synthesized by different method reactions (cycloaddition reaction, condensation reaction and cyclocondensation elimination reaction) of cinnamonitrile, aromatic aldehydes, chloroacetyl chloride, thioglycolic acid and nitroso compounds, respectively.

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Pyrazolone, Isoxazolone, Pyrimidinone, Pyrimidinothione, thiazolidinone and β‐lactam incorporating 2‐oximino benzpyrid‐4‐one derivatives have been synthesized by cyclocondensation addition reaction and cycloaddition of hydrazine hydrate, phenyl hydrazine, hydroxylamine, urea, thiourea, mercapto acetic acid, and chloroacetylchloride, respectively.