Synthesis, Antibacterial, Antioxidant Activity and QSAR Studies of Novel 2-Arylidenehydrazinyl-4-arylthiazole Analogues
作者:Mohammad Sayed Alam、Junaid Uddin Ahmed、Dong-Ung Lee
DOI:10.1248/cpb.c14-00616
日期:——
A novel series of 2-arylidenehydrazinyl-4-arylthiazole analogues (3a–p) was designed and synthesized in excellent yields using a rapid, simple, efficient methodology. Sixteen novel compounds were screened for in vitro antimicrobial activities against eleven bacteria, namely, Staphylococcus aureus, Listeria monocytogenes, Enterococcus faecalis, Bacillus subtilis, Klebsiella pneumonia, Citrobacter freundii, Cronobacter sakazakii, Salmonella enteritidis, Escherichia coli, Yersinia pestis, and Pseudomonas aeruginosa. All 16 compounds showed significant anti-bacterial activities against both Gram-positive and Gram-negative bacteria. In particular, compound 3g showed potent inhibition of E. coli and K. pneumonia, compound 3i inhibited E. faecalis, compound 3n S. tythi and E. faecalis, and compound 3c E. coli and C. sakazakii. In fact, our results indicate that most of the compounds synthesized exhibit strong antibacterial activity. The qualitative structure–antibacterial activity relationships (QSAR) were studied using the physicochemical and quantum-chemical parameters of the ab initio Hartree–Fock model at the RHF/6-31G level of theory. A good qualitative correlation between predicted physicochemical parameters (log P and polar surface area (PSA)) and antibacterial activity has been found. The synthesized compounds were also evaluated for antioxidant activity. Compounds 3j, 3a and 3i exhibited the greatest antioxidant activity, with IC50 values of 0.66, 0.81, and 1.08 µM, respectively, which were comparable to that of ascorbic acid (IC50 0.87 µM). The promising antibacterial and antioxidant activities of some of these synthesized 2-arylidenehydrazinyl-4-arylthiazole derivatives, together with the results of quantum-chemical studies, could be helpful for the development of drugs to combat diseases caused by microorganisms and oxidative stress.
设计并合成了一系列新颖的2-芳亚甲基酰肼基-4-芳基噻唑类似物(3a-p),采用了快速、简单且高效的方法,产率极佳。对十六种新型化合物进行了体外抗菌活性筛选,针对十一种细菌,包括金黄色葡萄球菌、单核细胞增生李斯特菌、粪肠球菌、枯草芽孢杆菌、肺炎克雷伯菌、弗氏柠檬酸杆菌、坂崎克罗诺杆菌、肠炎沙门氏菌、大肠埃希氏菌、耶尔森氏鼠疫杆菌和铜绿假单胞菌。所有十六种化合物均显示出对革兰氏阳性和革兰氏阴性细菌的显著抗菌活性。特别是,化合物3g对大肠埃希氏菌和肺炎克雷伯菌表现出强效抑制,化合物3i抑制粪肠球菌,化合物3n抑制肠炎沙门氏菌和粪肠球菌,化合物3c抑制大肠埃希氏菌和坂崎克罗诺杆菌。事实上,我们的结果表明,大多数合成化合物都表现出强大的抗菌活性。通过使用从头计算Hartree-Fock模型的物理化学和量子化学参数,在RHF/6-31G理论水平上研究了定性结构-抗菌活性关系(QSAR)。发现预测的物理化学参数(log P和极性表面积(PSA))与抗菌活性之间存在良好的定性相关性。合成的化合物还评估了其抗氧化活性。化合物3j、3a和3i表现出最强的抗氧化活性,IC50值分别为0.66、0.81和1.08 µM,可与抗坏血酸(IC50 0.87 µM)相媲美。这些合成的2-芳亚甲基酰肼基-4-芳基噻唑衍生物中部分化合物表现出有前景的抗菌和抗氧化活性,结合量子化学研究的结果,可能有助于开发针对由微生物和氧化应激引起的疾病的药物。