title: Synthesis and antimicrobial activity of new 2-[p-substituted-benzyl]-5-[substituted-carbonylamino]benzoxazoles.
abstract: A series of 23 new 2-[p-substituted-benzyl]-5-[p-substituted-phenyl/benzyl-carbonylamino]benzoxazole derivatives has been synthesized by reacting 5-amino-2-[p-substituted-benzyl]benzoxazoles with the appropriate carboxylic acid chlorides. The structures of the synthesized compounds were confirmed by IR and (1)H-NMR spectral data. Antimicrobial activities of the compounds were investigated using the twofold serial dilution technique against two gram-positive and two gram-negative bacteria and three Candida species in comparison with standard drugs. Microbiological results indicated that the newly synthesized 2-[p-substituted-benzyl]-5-[p-substituted-phenyl/benzyl-carbonylamino]benzoxazole derivatives (3-25) possessed a broad spectrum of activity, showing MIC values of 6.25-200 microg/mL against the gram-positive and gram-negative microorganisms tested. Moreover, they showed significant antifungal activity with MIC values of 3.12-100 microg/mL against the Candida species tested. Especially, with a MIC value of 3.12 microg/mL, 2-benzyl-5-[p-bromobenzyl-carbonylamino]benzoxazole 9 displayed the same activity against C. glabrata as the standard drug myconazol.
authors.affiliation: Ankara University, Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Tandogan, Ankara, Turkey.
authors.forename: Ilkay
authors.initials: I
authors.lastname: Yildiz-Oren
authors.forename: Betul
authors.initials: B
authors.lastname: Tekiner-Gulbas
authors.forename: Ismail
authors.initials: I
authors.lastname: Yalcin
authors.forename: Ozlem
authors.initials: O
authors.lastname: Temiz-Arpaci
authors.forename: Esin
authors.initials: E
authors.lastname: Aki-Sener
authors.forename: Nurten
authors.initials: N
authors.lastname: Altanlar
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D000935:Antifungal Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D001583:Benzoxazoles / Q000138:chemical synthesis* / Q000494:pharmacology; D002175:Candida / Q000187:drug effects; D015195:Drug Design; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D013329:Structure-Activity Relationship
chemical_list: D000900:Anti-Bacterial Agents; D000935:Antifungal Agents; D001583:Benzoxazoles