Synthesis and Anti-Bacterial Activities of Some Novel Schiff Bases Derived from Aminophenazone
作者:Abdullah M. Asiri、Salman A Khan
DOI:10.3390/molecules15106850
日期:——
A series of 1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one-containing Schiff bases were synthesized, characterized and screened for their antibacterial activities. The structures of the synthesized compounds were established by spectroscopic (FT-IR, 1H-NMR, 13C-NMR, MS) and elemental analyses. The anti-bacterial activities (with MIC values) of compounds were evaluated. The anti-bacterial screening results reveal that among the six compounds screened, four compounds showed moderate to good anti-bacterial activity. Among the tested compounds, the most effective compounds against four bacterial strains, viz. Escherichia coli, Staphylococcus aureus, Salmonella typhimurium and Streptococcus pyogenes, are [(2-Chlorobenzylidene)amino]-1,5-dimethyl-2-phenyl-1,2-dihydropyrazol-3-one (4) and [(1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-ylimino)methyl]benzonitrile (5) with MIC values of 6.25 μg/mL.
本研究合成了一系列 1,5-二甲基-2-苯基-1,2-二氢-3H-吡唑-3-酮希夫碱,并对其进行了表征和抗菌活性筛选。通过光谱(FT-IR、1H-NMR、13C-NMR、MS)和元素分析确定了合成化合物的结构。对化合物的抗菌活性(MIC 值)进行了评估。抗菌筛选结果表明,在筛选出的 6 种化合物中,有 4 种化合物显示出中等至良好的抗菌活性。在所测试的化合物中,对四种细菌菌株(即大肠杆菌、链球菌、痢疾杆菌)抗菌效果最好的化合物是 "嗜酸乳杆菌"。大肠杆菌、金黄色葡萄球菌、伤寒沙门氏菌和化脓性链球菌的最有效化合物是[(2-氯亚苄基)氨基]-1,5-二甲基-2-苯基-1,2-二氢吡唑-3-酮(4)和[(1,5-二甲基-3-氧代-2-苯基-2,3-二氢-1H-吡唑-4-基亚胺基)甲基]苯腈(5),其 MIC 值为 6.25微克/毫升。