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Objectives: The in vitro antioxidant properties of some 2-(2-phenyl)-1H-benzo(d)imidazol-1-yl)-N'-(arylmethylene) acetohydrazide derivatives (1-12) were investigated in this study. Materials and Methods: The in vitro antioxidant activity of compounds 1-12 was explored by determination of rat liver microsomal nicotinamideadenine dinucleotide phosphate dependent inhibition on lipid peroxidation (LPO) levels and microsomal ethoxyresorufin O-deethylase (EROD) activity. Results: All synthesised compounds had LPO inhibitory activity (15-57%) except compound 6, which contains a thiophene ring. Almost all the compounds displayed slightly inhibitory activity (2-20%) on EROD. Conclusion: The most active compound, 3 bearing a p-bromophenyl substituent at the second position of the benzimidazole ring, caused 57% inhibition of LPO level, while butylated hydroxytoluene showed 65% inhibition. None of the synthesised compounds had a marked inhibitory effect on EROD activity. [ABSTRACT FROM AUTHOR]

The synthesis, characterization and liquid crystalline properties of N4,N4′-bis((1 H-benzo[ d ]imidazol-2-yl)methyl)-3,3′-dimethyl-[1,1′-biphenyl]-4,4′-diamine and of their corresponding Mn(II), Fe(II), Ni (II), Cu(II), and Zn(II) complexes are described. The ligand and complexes have been characterized by elemental analysis, magnetic susceptibility measurements (µeff), conductometric measurements and Fourier Transform Infrared (FTIR), Nuclear Magnetic Resonance ( 1 H NMR), ( 13 C-NMR) and UV–Vis spectroscopy. Spectral investigations suggested octahedral coordination geometrical arrangement for M(II) complexes. The phase transition temperatures were detected by differential scanning calorimetry (DSC) analysis and the phases are confirmed by optical polarizing microscopy (POM). The DSC and POM supported the mesomorphic properties of the uncoordinated ligand in which the enantiotropic smectic phases were recorded. However, not all of their corresponding M(II) complexes are liquid crystal. [ABSTRACT FROM AUTHOR]

Benzodiazepines are used as anxyolytic, hypnotic, sedative and antidepressant drugs and to treat anxiety, insomnia, and epileptic seizures and show other types of biological activities. In this study, ten new 4(2)-(8-hydroxyquinolinil-5)-2(-4)-aryl-2,3-dihydro-1H-1,5-benzodiazepines and their rearrangement products, 2- substituted benzimidazoles, were synthesized from 1-aryl-3- (8-hydroxyquinolinil-5) propenone-1 (-3) and ophenylenediamine in methanol-triethylamine (1:1) solution. The reaction between the diamine and chalcones containing the 8-hydroxyquinoline fragment was carried out under mild conditions by base-catalysis amination of the β-enonic fragment of the chalcones followed by cyclocondensation. The structures of these compounds were studied by spectroscopic methods (IR and 1H-NMR) and their chelating properties were demonstrated. We calculated and discuss their theoretical biological activity, and the influence of metal quelation on the electron acceptor hydroxyquinolinic fragment on the electronic spectra. [ABSTRACT FROM AUTHOR]

In the current work, new benzimidazole-based acetamide derivatives (2a-u) were synthesized and screened for their in vitro antimicrobial activity. Among these derivatives, compounds 2b-2g were found to be the most promising antibacterial agents against Pseudomonas aeruginosa. These compounds and streptomycin exhibited the same level of antibacterial activity with a MIC value of 125 µg/mL. Compounds 2p, 2s, 2t and 2u were the most potent antifungal derivatives against Candida krusei with a MIC value of 125 µg/mL when compared with ketoconazole (MIC= 62.5 µg/mL). Compounds 2s and 2u also exhibited the highest inhibitory activity against Fusarium solani with a MIC value of 125 µg/mL, whereas ketoconazole showed its antifungal activity with a MIC value of 62.5 µg/mL. [ABSTRACT FROM AUTHOR]

Purpose: The synthesis of eight new benzimidazole derivatives bearing dithiocarbamate moiety and subsequently their anticholinesterase activity evaluations were aimed in this present study. Material and Methods: 2-Bromoacetylbenzimidazole react with dithiocarbamate salt derivatives and the resulted compounds were elucidated by 1H NMR, mass spectral data, and elemental analyses. Each derivative was evaluated for its ability to inhibit acetylcholinesterase (AChE) in vitro by using a modification of Ellman's spectrophotometric method. Results: The new compound 1-methyl-2{2'[(N,Ndimethylaminothiocarbamoylthio)-acetyl]}benzimidazole (2b) can be identified as promising anticholinesterase agent in vitro due to its moderate inhibition effect, which is about 37%, when compared with standard substance Donepezil under the same experimental conditions. Conclusion: In comparing with the reference standard, among the synthesized eight new compounds the only compound namely 1-methyl-2{2'[(N,Ndimethylaminothiocarbamoyl-thio)-acetyl]}benzimidazole (2b) has a promising anticholinesterase activity. [ABSTRACT FROM AUTHOR]

Coumarin-7 and its isomer 4-(2-benzimidazolyl)-7-(diethylamino)coumarin were synthesised using condensation of the corresponding formylcoumarin with o-phenylenediamine as the key step. Moreover, absorption and fluorescence emission spectra of these two coumarins were recorded. [ABSTRACT FROM AUTHOR]