Synthesis, Spectroscopic Studies and Antibacterial Activity of New Lauroyl Thiourea Amino Acid Derivatives
作者:M.A. Kadir、R. Ramli、M.S.M. Yusof、N. Ismail、N. Ngah
DOI:10.14233/ajchem.2016.19430
日期:——
Four new thiourea compounds have been successfully synthesized and characterized from combination of lauroyl chloride, ammonium thiocyanate and simple amino acids in acetone. The structure of the respective compounds, namely 3-(3-dodecanoyl-thioureido)propionic acid (R1), 2-(3-dodecanoyl-thioureido)-3-methyl butyric acid (R2), (3-dodecanoyl-thioureido)acetic acid (R3) and 2-(3-dodecanoyl-thioureido)-3-phenyl propionic acid (R4) are confirmed by combination of spectroscopic techniques such as infrared, ultraviolet and nuclear magnetic resonance. The antibacterial activity of these compounds are investigated towards selected bacteria and the results show that compound R4 displays better antibacterial activity compared to R1-R3 and as well as to few reported compounds. Compound R4 shows good antibacterial activity towards two Gram-negative bacteria Escherichia coli and Salmonella typhimurium, with inhibition zone approximately 8 mm wide and minimum inhibitory concentration (MIC) 50 μg/mL, respectively. The good results given by R4 might be attributed by the presence of alkyl and phenyl group that increases the lipophilicity and stability of the compounds.
在丙酮中将月桂酰氯、硫氰酸铵和简单氨基酸结合在一起,成功合成了四种新的硫脲化合物,并对其进行了表征。通过结合红外线、紫外线和核磁共振等光谱技术,确认了相应化合物的结构,即 3-(3-十二碳酰硫脲基)丙酸(R1)、2-(3-十二碳酰硫脲基)-3-甲基丁酸(R2)、(3-十二碳酰硫脲基)乙酸(R3)和 2-(3-十二碳酰硫脲基)-3-苯基丙酸(R4)。结果表明,与 R1-R3 以及少数已报道的化合物相比,化合物 R4 显示出更好的抗菌活性。化合物 R4 对大肠杆菌和鼠伤寒沙门氏菌这两种革兰氏阴性菌具有良好的抗菌活性,抑菌区宽约 8 毫米,最低抑菌浓度(MIC)为 50 微克/毫升。R4 的良好效果可能是由于烷基和苯基的存在增加了化合物的亲脂性和稳定性。