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.