BackgroundThere is a dire need for the discovery and development of new antimicrobial agents after several experiments for a better resistance of microorganisms towards antimicrobial agents become a serious health problem for a few years in the past. As benzimidazole possess various types of biological activities, it has been synthesized, in the present study, a new series of (5-(3-(1H-benzo[d]imidazol-2-yl)-4-hydroxybenzyl)benzofuran-2-yl)(phenyl)methanone analogs by using the condensation and screened for its in vitro antimicrobial activity and cytotoxicity.ResultsThe synthesized (5-(3-(1H-benzo[d]imidazol-2-yl)-4-hydroxybenzyl) benzofuran-2-yl)(phenyl)methanone analogs were confirmed by IR, 1H and 13C-NMR, MS spectra and HRMS spectral data. The synthesized compounds were evaluated for their in vitro antimicrobial potential against Gram-positive (Bacillus subtilis, Bacillus megaterium, Staph aureus and Streptococcus pyogenes), Gram-negative (Escherichia coli, Proteus vulgaris, Proteus mirabilis and Enterobacter aerogenes) bacterial and fungal (Aspergillus niger, Candida albicans, Fusarium oxysporum, Fusarium solani) strains by disc diffusion method and the minimum inhibitory concentration (MIC) in which it has been recorded in microgram per milliliter in comparison to the reference drugs, ciprofloxacin (antibacterial) and nystatin (antifungal). Further, the cytotoxicity (IC50 value) has also been assessed on human cervical (HeLa), Supt1 cancer cell lines by using MTT assay.ConclusionsThe following screened compounds (4d), (4f), (4g), (4k), (4l), (4o) and (4u) were found to be the best active against all the tested bacterial and fungal strains among all the demonstrated compounds of biological study. The MIC determination was also carried out against bacteria and fungi, the compounds (4f) and (4u) are found to be exhibited excellent potent against bacteria and fungi respectively. The compounds (4f) and (4u) were shown non-toxic in nature after screened for cytotoxicity against the cancer cell lines of human cervical (HeLa) and Supt1. Additionally, structure and antibacterial activity relationship were also further supported by in silico molecular docking studies of the active compounds against DNA topoisomerase. Electronic supplementary materialThe online version of this article (10.1186/s13065-017-0364-3) contains supplementary material, which is available to authorized users.

A novel series of thiazole-triazole-piperazine multi hybrids was designed for antimicrobial activity and the synthetic method for this series has been developed by copper catalyzed 1,3-dipolar cycloaddition of thiazole-based azide with Boc-piperidine based alkyne in the presence of CuSO4 and sodium ascorbate. Boc deprotection followed by alkylation of piperidine moiety in hybrid derivatives was also carried out. All the target compounds were confirmed using FTIR, 1H NMR, 13C NMR and LC-MS spectral techniques. These compounds were screened for the antimicrobial activity against bacteria and fungi. The antimicrobial activities are also comparable to standard drugs ampicillin and clotrimazole. All the molecules showed good to moderate activity and supported by molecular docking studies and ADME prediction.

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Synthesis of novel 4‐(1‐(2‐cyclopropylphenyl)‐2‐(4‐substituted‐1H‐1,2,3‐triazol‐1‐yl)ethyl)morpholine analogues were demonstrated by conventional synthetic procedures. The structure of all the newly synthesized compounds were determined by 1H‐NMR, 13C‐NMR, HRMS and CHN analysis. Cytotoxicity of all synthesized compounds were tested against MCF‐7 Cell lines in different concentrations. The IC50 value of compounds was calculated using graph Pad Prism Version5.1. 4‐chloro substituted analogue exhibited superior result than the standard reference Doxorubicin drug. Compounds which are containing 3‐methoxy, 2‐methoxy and 4‐methoxy substituents showed a moderate effect, and 2‐chloro, 3‐triflouromethyl and 2‐methyl substituted analogues showed lower results. Molecular docking studies performed on the crystal structure of human estrogen receptor alpha ligand‐binding domain with all molecules and are well in agreement with cell line studies. The predicted pharmacokinetics support that these compounds have more drug‐likeness properties.

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