Synthesis, Characterization, and Antimicrobial Evaluation of Oxadiazole Congeners
作者:Bassem Sadek、Khairi Mustafa Salem Fahelelbom
DOI:10.3390/molecules16064339
日期:——
A series of 1,3-oxazole, 1,3-thiazole, isomeric 1,2,4-oxadiazole, 1,3,4-oxadiazole, and 1,2,3,4-tetrazole heterocycles was synthesized. All the compounds shared as a common feature the presence of a 4-hydroxyphenyl substituent. The structures of the synthesized compounds were confirmed by MS, 1H-NMR, and elemental analysis. In vitro antimicrobial activity for all the newly synthesized compounds at concentrations of 200-25 μg/mL was evaluated against Gram+ve organisms such as methicillin-resistant Staphylococcus aureus (MRSA), Gram–ve organisms such as Escherichia coli (E. coli), and the fungal strain Aspergillus niger (A. niger) by the cup plate method. Ofloxacin and ketoconazole (10 μg/mL) were used as reference standards for antibacterial and antifungal activity, respectively. Compounds 15, 16, and 20 showed notable antibacterial and antifungal activities at higher concentrations (200 μg/mL), whereas 17-19 were found to display significant antibacterial or antifungal activity (25-50 μg/mL) against the Gram+ve, Gram–ve bacteria, or fungal cells used in the present study.
合成了一系列1,3-噁唑、1,3-噻唑、异构的1,2,4-噁二唑、1,3,4-噁二唑和1,2,3,4-四唑杂环化合物。所有化合物共有的特点是存在4-羟苯基取代基。通过质谱、氢核磁共振和元素分析确认了合成化合物的结构。针对所有新合成化合物,在200-25 μg/mL浓度下,通过杯盘法评估了它们对阳性菌如耐甲氧西林金黄色葡萄球菌(MRSA)、阴性菌如大肠杆菌(E. coli)和真菌如黑曲霉(A. niger)的体外抗菌活性。氧氟沙星和酮康唑(10 μg/mL)分别作为抗菌和抗真菌活性的参考标准。化合物15、16和20在较高浓度(200 μg/mL)下显示出显著的抗菌和抗真菌活性,而17-19则在25-50 μg/mL浓度下对研究中使用的阳性菌、阴性菌或真菌细胞显示出显著的抗菌或抗真菌活性。