Synthesis, biological evaluation and 2D-QSAR analysis of benzoxazoles as antimicrobial agents
作者:Tugba Ertan、Ilkay Yildiz、Betul Tekiner-Gulbas、Kayhan Bolelli、Ozlem Temiz-Arpaci、Semiha Ozkan、Fatma Kaynak、Ismail Yalcin、Esin Aki
DOI:10.1016/j.ejmech.2008.04.001
日期:2009.2
A new series of 5(or 6)-nitro/amino-2-(substituted phenyl/benzyl)benzoxazole derivatives (1a-1m, 2a-21) were synthesized and evaluated for antibacterial and antifungal activities against Staphylococcus aureus, Bacillus subtilis, Klebsiella pneumoniae, Pseudomonas aeruginosa, Escherichia coli, Candida albicans and their drug-resistant isolate. Microbiological results indicated that the synthesized compounds possessed a broad spectrum of activity against the tested microorganisms at MIC values between >400 and 12.5 mu g/ml. The results against B. subtilis, P. aeruginosa, drug-resistant B. subtilis, drug-resistant E. coli, and C. albicans isolate for these kinds of structures are quite encouraging. The 2D-QSAR analysis of a set of newly and previously synthesized benzoxazoles tested for growth inhibitory activity against B. subtilis ATCC 6633 was performed by using the multivariable regression analysis. The activity contributions for substituent effects of these compounds were determined from the correlation equation for predictions of the lead optimization. (C) 2008 Elsevier Masson SAS. All rights reserved.
Optimization of aggregation-induced phosphorescence enhancement in mononuclear tricarbonyl rhenium(<scp>i</scp>) complexes: the influence of steric hindrance and isomerism
tricarbonyl rhenium(I) complex (ReL1) that exhibits rare aggregation-induced phosphorescence enhancement (AIPE) behavior, two new complexes (ReL3 and ReL4) were prepared and investigated. They incorporate a 2-pyridyl-1,2,4-triazole (pyta) ligand connected to a 2-phenylbenzoxazole (PBO) moiety. Complex ReL3 differs from ReL1 by the presence of a bulky tert-butyl substituent, and ReL4 is an isomer where the