Synthesis of novel 2-thioxo-4-imidazolidinone derivatives and evaluation of their antibacterial, and antifungal activities
作者:Layla AbdulJabar、Dakhil Mutalq、Ali Al-Shawi
DOI:10.21608/ejchem.2021.66960.3442
日期:2021.3.28
The infectious diseases caused by antimicrobials pathogens are difficult, harmful, and sometimes impossible to treat. Therefore, design new drugs to treat antimicrobial infections is the biggest challenge for modern medicine. 2-Thioxo-4-imidazolidinone is used for the synthesis of a wide variety of new substituted imidazolidinone derivatives. In this study, we designing eight novel compounds derived for the 2-thioxo-4-imidazolidinones (5a-h). The preparation was in two steps via Micheal addition of phenyl hydrazide (2a), 4-methyl phenyl hydrazide 2b on N-substituted maleimides 1a-d in ethanol, and the second step by reaction of maleimide derivatives with cyclohexyl isothiocyanate 4 in acetonitrile. The chemical structures of the compounds were identified using FT-IR, 1H-NMR, 13C-NMR, and mass spectra, as well as the melting point. The antibacterial and antifungal evaluation was carried out to target their activities. Compound N-(5-(2-((4-chlorophenyl)amino)-2-oxoethyl)-3-cyclohexyl-4-oxo-2-thioxoimidazolidin-1-yl) benzamide (5b) exhibited antibacterial activity toward Staphylococcus aureus and Pseudomonas aeruginosa with equal minimum inhibitory concentration (MIC) values of 25 mg/mL. Compounds N-(3-cyclohexyl-4-oxo-5-(2-oxo-2-(phenylamino)ethyl)-2-thioxoimidazolidin-1-yl) benzamide (5a), N-(5-(2-((4-chlorophenyl)amino)-2-oxoethyl)-3-cyclohexyl-4-oxo-2-thioxoimidazolidin-1-yl) benzamide (5b), N-(5-(2-((4-bromophenyl)amino)-2-oxoethyl)-3-cyclohexyl-4-oxo-2-thioxo imidazolidin-1-yl) benzamide (5c), and N-(3-cyclohexyl-4-oxo-5-(2-oxo-2-(phenylamino)ethyl)-2-thioxoimidazolidin-1-yl)-4-methyl benzamide (5e) exhibited antifungal activity toward Candida albicans, while all compounds exhibited antifungal activity toward Aspergillus niger except for compound 5h, with various MIC values. In conclusion, the results demonstrate that the new compounds have to promise as antifungal agents. Moreover, compound 5b could develop as an antibacterial agent.
由抗菌病原体引起的感染性疾病难以治疗、危害巨大,有时甚至无法治疗。因此,设计治疗抗菌感染的新药是现代医学面临的最大挑战。2-Thioxo-4-imidazolidinone 可用于合成多种新的取代咪唑烷酮衍生物。在这项研究中,我们设计了 8 种新型化合物,它们来自 2-硫酮-4-咪唑烷酮(5a-h)。制备过程分为两步,第一步是在乙醇中将苯基酰肼(2a)和 4-甲基苯基酰肼 2b 与 N-取代马来酰亚胺 1a-d 加成,第二步是马来酰亚胺衍生物与环己基异硫氰酸酯 4 在乙腈中反应。利用 FT-IR、1H-NMR、13C-NMR 和质谱以及熔点确定了化合物的化学结构。针对这些化合物的活性进行了抗菌和抗真菌评估。化合物 N-(5-(2-((4-氯苯基)氨基)-2-氧代乙基)-3-环己基-4-氧代-2-硫酮咪唑烷-1-基)苯甲酰胺(5b)对金黄色葡萄球菌和铜绿假单胞菌具有抗菌活性,最低抑菌浓度(MIC)为 25 毫克/毫升。化合物 N-(3-环己基-4-氧代-5-(2-氧代-2-(苯基氨基)乙基)-2-硫酮咪唑烷-1-基)苯甲酰胺(5a)、N-(5-(2-((4-氯苯基)氨基)-2-氧代乙基)-3-环己基-4-氧代-2-硫酮咪唑烷-1-基)苯甲酰胺(5b), N-(5-(2-((4-溴苯基)氨基)-2-氧代乙基)-3-环己基-4-氧代-2-硫酮咪唑烷-1-基)苯甲酰胺(5c)、和 N-(3-环己基-4-氧代-5-(2-氧代-2-(苯基氨基)乙基)-2-硫酮咪唑烷-1-基)-4-甲基苯甲酰胺(5e)对白色念珠菌具有抗真菌活性,而除化合物 5h 外,所有化合物对黑曲霉均具有抗真菌活性,其 MIC 值各不相同。总之,研究结果表明,这些新化合物有望成为抗真菌剂。此外,化合物 5b 可以发展成为一种抗菌剂。