Synthesis, Biological Evaluation and Study of the Effect of Various N-Substituents on the Thermal Stabilities of Some New Diethanolamine Derivatives
作者:Muhammad Yar、Nafeesa Mushtaq、Sadia Afzal、Abdul Samad Khan、Islam Ullah Khan、Muhammad Nadeem Akhter、Seema Zareen、Sohail Anjum Shahzad、Zulfiqar Ali Khan、Syed Ali Raza Naqvi、Nasir Mahmood、Lubna Tahir、Muhammad Saleem
DOI:10.14233/ajchem.2013.14543
日期:——
Diethanolamine and its derivatives are of considerable interest in medicinal and other industrial products. A series of new diethanolamine derivatives has been synthesized and characterized by 1H NMR, 13C NMR, FTIR and mass spectrometry. All synthesized compounds have been tested for their in vitro antibacterial activity against pathogenic microorganisms Escherichia coli, Staphylococcus aureus, Micrococcus luteus, Pseudomonas aeruginosa, Bacillus subtilis, Pasteurrella mutocida, Rhizopus oryzae and Salmonella typhi. Among the tested compounds, compounds 2a, 2b, 2c, 3a and 4b have been found to be most potent members, which inhibited most of the pathogens used in the assay. Diethanolamine must posses tosyl or trifluoro groups in order to have good antimicrobial activities. All synthesized derivatives exhibited average FRAP activity and considerably good metal chelating activity and compound 2c showed excellent ABTS radical scavanging among all tested derivatives. Thermal stability and the effect of various N-protected groups on the thermal stability and degradation of selected diethanolamine derivatives (free flowing oils at room temperature and solid derivative 2a) has been studied by TGA and DSC analysis.
二乙醇胺及其衍生物在医药和其他工业产品中具有重要意义。我们合成了一系列新的二乙醇胺衍生物,并通过 1H NMR、13C NMR、傅立叶变换红外光谱和质谱法对其进行了表征。对所有合成化合物进行了体外抗菌测试,以检测它们对病原微生物大肠杆菌、金黄色葡萄球菌、黄体小球菌、铜绿假单胞菌、枯草芽孢杆菌、突变巴斯德菌、根瘤蚜和伤寒沙门氏菌的抗菌活性。在测试的化合物中,发现化合物 2a、2b、2c、3a 和 4b 是最有效的成员,它们抑制了试验中使用的大多数病原体。二乙醇胺必须含有甲苯基或三氟基团才能具有良好的抗菌活性。所有合成的衍生物都表现出平均的 FRAP 活性和相当好的金属螯合活性,在所有测试的衍生物中,化合物 2c 表现出优异的 ABTS 自由基清除能力。通过 TGA 和 DSC 分析,研究了热稳定性以及各种 N 保护基团对选定二乙醇胺衍生物(室温下的自由流动油和固体衍生物 2a)的热稳定性和降解的影响。