Synthesis of Some Novel Quinazolinone Derivatives with Anticipated Biological Activity

The behavior of the benzoxazinone derivative 1 toward nitrogen and carbon nucleophiles was investigated and yielded compounds 2–4, 6, and 7. The oxadiazol derivatives 9–12 were obtained from the interaction of hydrazide 8 with benzoic acid in the presence of phosphoryl chloride and/or carbon disulfide in the presence of KOH followed by alkylation with ethyl iodide and hydrazinolysis with hydrazine hydrate, respectively. The quinazolinone derivatives 13 and 22 were utilized to construct new heterocyclic systems 15–21, 23, and 24 via interaction with different carbon electrophiles. Some of the newly synthesized compounds were characterized on the bases of spectroscopic data. Some of the synthesized compounds were screened for antimicrobial activity.