title: Synthesis and antioxidant properties of novel N-methyl-1,3,4-thiadiazol-2-amine and 4-methyl-2H-1,2,4-triazole-3(4H)-thione derivatives of benzimidazole class.
abstract: Some novel 1-methyl-4-(2-(2-substitutedphenyl-1H-benzimidazol-1-yl)acetyl)thiosemicarbazides (16a-20a), 5-[(2-(substitutedphenyl)-1H-benzimidazol-1-yl)methyl]-N-methyl-1,3,4-thiadiazol-2-amines (17b-20b), and 5-[(2-(substitutedphenyl)-1H-benzimidazol-1-yl)methyl-4-methyl-2H-1,2,4-triazole-3(4H)-thiones (16c-20c) were synthesized and tested for antioxidant properties by using various in vitro systems. Compounds 16a-20a were found to be a good scavenger of DPPH radical (IC(50), 26 microM; IC(50), 30 microM; IC(50), 43 microM; IC(50), 55 microM; IC(50), 74 microM, respectively) when compared to BHT (IC(50), 54 microM). Noteworthy results could not be found on superoxide radical. Compound 19b, which is the most active derivative inhibited slightly lipid peroxidation (28%) at 10(-3)M concentration. Compound 17c inhibited the microsomal ethoxyresorufin O-deethylase (EROD) activity with an IC(50)=4.5 x 10(-4)M which is similarly better than the specific inhibitor caffeine IC(50)=5.2 x 10(-4)M.
authors.affiliation: Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Ankara University, 06100 Ankara, Turkey. kus@pharmacy.ankara.edu.tr
authors.forename: Canan
authors.initials: C
authors.lastname: Kuş
authors.forename: Gülgün
authors.initials: G
authors.lastname: Ayhan-Kilcigil
authors.forename: Süheyla
authors.initials: S
authors.lastname: Ozbey
authors.forename: F Betül
authors.initials: FB
authors.lastname: Kaynak
authors.forename: Melek
authors.initials: M
authors.lastname: Kaya
authors.forename: Tülay
authors.initials: T
authors.lastname: Coban
authors.forename: Benay
authors.initials: B
authors.lastname: Can-Eke
mesh_terms: D000588:Amines / Q000737:chemistry*; D000818:Animals; D000975:Antioxidants / Q000138:chemical synthesis* / Q000737:chemistry / Q000145:classification / Q000494:pharmacology*; D001562:Benzimidazoles / Q000138:chemical synthesis* / Q000737:chemistry / Q000145:classification / Q000494:pharmacology*; D018360:Crystallography, X-Ray; D005609:Free Radicals / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D008297:Male; D008745:Methylation; D008958:Models, Molecular; D015394:Molecular Structure; D051381:Rats; D017208:Rats, Wistar; D013329:Structure-Activity Relationship; D013830:Thiadiazoles / Q000737:chemistry*; D013871:Thiones / Q000737:chemistry*
chemical_list: D000588:Amines; D000975:Antioxidants; D001562:Benzimidazoles; D005609:Free Radicals; D013830:Thiadiazoles; D013871:Thiones; C031000:benzimidazole