Synthesis and Evaluation of Novel Benzimidazole Conjugates Incorporating Amino Acids and Dipeptide Moieties
作者:Nesrin Bugday、F.F. Zehra Kucukbay、Elif Apohan、Hasan Kucukbay、Ayfer Serindag、Ozfer Yesilada
DOI:10.2174/1570178614666170203093406
日期:2017.4.13
Background: Amino acids, short peptide sequences and benzimidazole derivatives play an
increasingly important role as therapeutics in areas including antibacterial, antifungal, antiviral, antiinflammatory,
antiparasitic, antibiofilm, antidiabetic, and anticancer.
Methods: Some novel amino acids and glycine-glycine dipeptide benzimidazole conjugates were synthesized
by facile acylation reactions through DCC mediated reactions and their structures were identified
by 1H-NMR, 13C-NMR and FT-IR spectroscopic techniques and elemental analysis. In vitro antimicrobial
activities of some compounds against Gram positive (Staphylococcus aureus and Enterobacter
faceium NJ-1) and Gram negative bacteria (Escherichia coli and Pseudomonas aeruginosa),
and yeasts (Candida albicans and Candida tropicalis) were determined by MIC method. Their antioxidant
activities were also detected by DPPH method.
Results: Sixteen novel benzimidazole conjugates incorporating glycine, alanine, phenylalanine, cysteine
and glycine-glycine dipeptide were synthesized and their structures were identified by spectroscopic
techniques and elemental analysis. All of the compounds tested showed in vitro antimicrobial
and antioxidant activities.
Conclusion: Sixteen novel benzimidazole amino acid/dipeptide conjugates were synthesized using
DCC mediated one step reaction in moderate yield and high purity, under mild reaction conditions,
with full retention of the original chirality. Amino acid or dipeptide substitutions at position 1 of the
benzimidazoles were synthesized first time in this work. The results have indicated that the newly synthesized
compounds possess low to moderate antimicrobial and antioxidant activities.
背景:氨基酸、短肽序列以及苯并咪唑衍生物在包括抗菌、抗真菌、抗病毒、抗炎、抗寄生虫、抗生物膜、抗糖尿病和抗癌等领域中作为治疗药物扮演着越来越重要的角色。
方法:一些新型氨基酸和甘氨酸-甘氨酸二肽苯并咪唑偶联物通过DCC介导的酰化反应进行简便合成,并通过1H-NMR、13C-NMR和FT-IR光谱技术及元素分析鉴定其结构。通过MIC方法测定部分化合物对革兰氏阳性菌(金黄色葡萄球菌和Enterobacter faceium NJ-1)和革兰氏阴性菌(大肠杆菌和铜绿假单胞菌)以及酵母菌(白色念珠菌和热带念珠菌)的体外抗菌活性。它们的抗氧化活性也通过DPPH方法检测。
结果:合成了包含甘氨酸、丙氨酸、苯丙氨酸、半胱氨酸和甘氨酸-甘氨酸二肽的十六种新型苯并咪唑偶联物,并通过光谱技术和元素分析鉴定了它们的结构。所有测试化合物均显示出体外抗菌和抗氧化活性。
结论:通过DCC介导的一步反应,在温和反应条件下,以中等产率和高纯度合成了十六种新型苯并咪唑氨基酸/二肽偶联物,完全保留了原始手性。在本工作中首次合成了在苯并咪唑1位进行氨基酸或二肽取代的化合物。结果表明,新合成的化合物具有低至中等的抗菌和抗氧化活性。