Abstract
A series of seven 2-amino-4-arylthiazoles were prepared following Hantzsch’s modified method under microwave irradiation. A set of 50 derivatives was obtained and the in vitro activity against Giardia intestinalis was evaluated. The results on the biological activity revealed that, in general, the N-(5-bromo-4-aryl-thiazol-2-yl)-acetamide scaffold showed high bioactivity. In particular, compounds 6e (IC50 = 0.39 μM) and 6b (IC50 = 0.87 μM) were found to be more potent than the positive control metronidazole. Citoxicity and acute toxicity tests performed showed low toxicity and high selectivity of the most active compounds (6e SI = 139, 6b SI = 52.3). A QSAR analysis was applied to a data set of 37 obtained 2-amino-4-arylthiazoles derivatives and the best model described a strongly correlation between the anti-giardiasic activity and molecular descriptors as E2M, RDF115m, F10, MATS6v, and Hypnotic-80, with high statistical quality. This finding indicates that N-substituted aminothiazole scaffold should be investigated for the development of highly selective anti-giardial agent.
一个由七个2-氨基-4-芳基噻唑制备的系列化合物,采用汉茨修饰方法在微波辐射下制备。获得了一组50个衍生物,并对其对贾第虫的体外活性进行了评估。生物活性结果显示,总体上,N-(5-溴-4-芳基噻唑-2-基)-乙酰胺骨架表现出较高的生物活性。特别是,化合物6e (IC50 = 0.39 μM) 和6b (IC50 = 0.87 μM) 显示比阳性对照甲硝唑更强的活性。进行的细胞毒性和急性毒性测试显示,最活性的化合物具有低毒性和高选择性(6e SI = 139,6b SI = 52.3)。对获得的37个2-氨基-4-芳基噻唑衍生物数据集进行了QSAR分析,最佳模型描述了抗贾第虫活性与分子描述符(如E2M、RDF115m、F10、MATS6v和Hypnotic-80)之间的强相关性,具有很高的统计质量。这一发现表明,N-取代氨基噻唑骨架应该被用于开发高度选择性的抗贾第虫药物。