title: Synthesis and anti-microbial screening of some Schiff bases of 3-amino-6,8-dibromo-2-phenylquinazolin-4(3H)-ones.
abstract: In the present study, a series of novel Schiff bases were synthesized by condensation of 3-amino-6,8-dibromo-2-phenylquinazolin-4(3H)-ones with different aromatic aldehydes via cyclized intermediate 6,8-dibromo-2-phenyl benzoxazin-4-one. The chemical structures were confirmed by means of IR, (1)H NMR, (13)C NMR, Mass spectral and Elemental analysis. These compounds were screened for anti-bacterial (Staphylococcus aureus ATCC-9144, Staphylococcus epidermidis ATCC-155, Micrococcus luteus ATCC-4698, Bacillus cereus ATCC-11778, Escherichia coli ATCC-25922, Pseudomonas aeruginosa ATCC-2853, and Klebsiella pneumoniae ATCC-11298) and anti-fungal (Aspergillus niger ATCC-9029 and Aspergillus fumigatus ATCC-46645) activities by paper disc diffusion technique. The minimum inhibitory concentrations (MICs) of the compounds were also determined by agar streak dilution method. Among the synthesized compounds 3-(3,4,5-trimethoxybenzylideneamino)-6,8-dibromo-2-phenylquinazolin-4(3H)-one 10 was found to be the most potent anti-microbial activity with MICs of 18.9, 19.1, 18.8, 21.7, 18.2, 19.3, 16.7, 8.6 and 10.1 microg/ml against above mentioned respective strains. Compounds were found to exhibit more anti-fungal than anti-bacterial activity.
authors.affiliation: Department of Pharmaceutical Chemistry, C.L. Baid Metha College of Pharmacy, Jyothi Nagar, Rajiv Gandhi Salai, Thorapakkam, Chennai 600 097, Tamil Nadu, India.
authors.forename: Perumal
authors.initials: P
authors.lastname: Panneerselvam
authors.forename: Bilal Ahmad
authors.initials: BA
authors.lastname: Rather
authors.forename: Dontireddy
authors.initials: D
authors.lastname: Ravi Sankar Reddy
authors.forename: Natesh
authors.initials: N
authors.lastname: Ramesh Kumar
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D000935:Antifungal Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D005658:Fungi / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D052999:Quinazolinones / Q000138:chemical synthesis* / Q000494:pharmacology; D012545:Schiff Bases / Q000138:chemical synthesis* / Q000494:pharmacology; D013329:Structure-Activity Relationship
chemical_list: D000900:Anti-Bacterial Agents; D000935:Antifungal Agents; D052999:Quinazolinones; D012545:Schiff Bases