SYNTHESIS AND EVALUATION OF ANTIMICROBIAL ACTIVITY OF QUINAZOLINONE DERIVATIVES

Objective: The present study aims to synthesis and evaluation of antimicrobial activity of quinazolinone derivatives. Methods: Methyl anthranilate react with acetyl chloride in ethanol gives methyl-2 acetamido benzoate (1) which on reaction with hydrazine hydrate gives 3-amino-2 methyl 4-(3H)-quinazolinone.(2) The amino group of synthesized quinazolinone with substituted acid chloride which gives 3-Chloroacetyl amino-2-methyl-4-quinazolinone (3) which on condensation with various primary amines gives 2-(2-methyl-4-oxo-4H-quinazoline-3yl-amino)-N-substituted acetamide (4a-4j). Results: The reaction sequence involves microwave-induced preparation of methyl-2 acetamido benzoate (1) from reaction of Methyl anthranilate react with acetyl chloride in ethanol. Further reaction with hydrazine hydrate gives 3-amino-2 methyl 4-(3H)-quinazolinone. (2) The amino group of synthesized quinazolinone with substituted acid chloride which gives 3-Chloroacetyl amino-2-methyl-4-quinazolinone (3) which on condensation with various primary amines gives 2-(2-methyl-4-oxo-4H-quinazoline-3yl-amino)-N-substituted acetamide (4a-4j). Which were characterized by IR and 1HNMR spectral data. Conclusion: All the synthesized compounds were screened for antimicrobial activity by Broth dilution method. Most of the derivatives showed good antimicrobial activity against Gram-Positive and Gram-negative bacteria.