Three-phase transport studies of benzimidazole ligands bearing hydrophobic N-alkyl substituents: transport of metal(II) ions (Ni, Cu, Zn, Cd) in single- and multiple-ion experiments †
作者:Craig J. Matthews、Troy A. Leese、Derek Thorp、Joyce C. Lockhart
DOI:10.1039/a705387h
日期:——
bearing hydrophobic N-alkyl substituents have been tested as transfer agents for metal(II) ions (Ni, Cu, Zn, Cd) using three-phase transport techniques. The transport was pH-dependent, so all comparisons were made with buffered feed and receiving phases at fixed pH. Variations in the nature and number [single and double N-alkyl-substituted bis(benzimidazole) ligands] of N-alkyl substituents, linker chain
Silphox [POCl<sub>3−<i>n</i> </sub>(SiO<sub>2</sub>)<sub> <i>n</i> </sub>] as a New, Efficient, and Heterogeneous Reagent for the Synthesis of Benzimidazole Derivatives Under Microwave Irradiation
Silphox [POCl3-n(SiO2)n] efficiently catalyzes the condensation of benzene-1,2-diamine with mono and dicarboxylic acids under microwave irradiation to afford benzimidazole derivatives in high yields and short reaction times.
Bisbenzimidazole Derivatives as Potential Antimicrobial Agents: Design, Synthesis, Biological Evaluation and Pharmacophore Analysis
作者:Ronak Haj Ersan、Kayhan Bolelli、Serpil Gonca、Aylin Dogen、Serdar Burmaoglu、Oztekin Algul
DOI:10.1007/s11094-021-02389-x
日期:2021.5
In an attempt to design and synthesize a potent class of antimicrobials, 1,2-phenylenediamine derivatives were reacted with various aliphatic and heteroaliphatic dicarboxylic acids to generate a small library of 26 head-to-head bisbenzimidazole compounds (16 – 42) using the polyphosphoric acid method. These compounds were screened for their antibacterial activity and their antifungal activity. Compound 25 showed maximum potency against both Gram-positive and Gram-negative bacterial strains with minimum inhibitory concentration (MIC) values in the range of 7.81 – 31.25 μg/mL. In particular, it showed the maximum MIC values of 7.81 μg/mL against Gram-negative bacteria, which was four-fold more active than the standard drug ampicillin (MIC = 32.25 μg/mL). Compound 19 was found to be the most active against S. aureus with a MIC value of < 3.90 μg/mL, whereas the remaining compounds showed only low-to-moderate activity. Furthermore, all compounds exhibited low activity against all fungal strains in comparison to the standard drug fluconazole. I addition, pharmacophore hypotheses were generated to analyze structure–activity relationships between the molecular structures and antimicrobial activities on E. coli. This pharmacophore model can be useful in order to design new antimicrobial drugs. It can be suggested that the substitution of a phenyl ring at the 5/6 and 5′/6′ positions in symmetric bisbenzimidazole derivatives produces compounds with promising antimicrobial activity.
Desymmetrization Reactions: A Convenient Synthesis of Aromatic Diamide Diamines
作者:Claude Picard、Nathalie Arnaud、Pierre Tisnès
DOI:10.1055/s-2001-16076
日期:——
0039-7881 Abstract: A two-step process for the synthesis of various diamide diamines derived from 1,n-diamino benzene compounds is described. The amidation reaction is simple, mild, involves readily available bis(N-acylthiazolidine-2-thione) derivatives as acylating agents and requires only stoichiometric equivalents of diamine and acylating agents.
Synthesis, crystal structure, and DNA-binding studies of different coordinate binuclear silver(<scp>i</scp>) complexes with benzimidazole open-chain ether ligands
作者:Huilu Wu、Jiawen Zhang、Chengyong Chen、Han Zhang、Hongping Peng、Fei Wang、Zaihui Yang
DOI:10.1039/c5nj01684c
日期:——
Three new binuclear silver(i) complexes with bis-benzimidazole ligands have been developed and they bind to CT-DNA in an intercalation mode.