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An efficient synthesis of benzimidazoles via a microwave technique and evaluation of their biological activities

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Abstract

A simple and practical protocol was developed for the synthesis of benzimidazoles. The protocol uses iminoester hydrochloride which is very useful in the reaction with 4,5-dichloro-1,2-phenylenediamine under microwave irradiation leading to the products with good yields and in short reaction times. This method can be used as a general technique for synthesizing benzimidazoles. The synthesized compounds were evaluated for their biological properties such as anti-lipase, antiviral, and antitumor activities. Five benzimidazol-1-acetic acid hydrazides showed slight antiviral activity at 25 μg/cm3 concentration despite their low toxicity. Substituted 2-benzylbenzimidazoles were active against adenocarcinoma (CT26) and melanoma (B16F10) cancer cell lines at concentrations below 10 μg/cm3. Six of the compounds showed anti-lipase activities at various concentrations; the IC50 value of one compound was 0.35 μg/cm3, which is similar activity to that of orlistat (0.32 μg/cm3).

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Acknowledgments

The authors gratefully acknowledge the financial support from the Scientific and Technical Research Council of Turkey (TÜBİTAK) through Project 108T356.

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Correspondence to Bahittin Kahveci.

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Kahveci, B., Menteşe, E., Özil, M. et al. An efficient synthesis of benzimidazoles via a microwave technique and evaluation of their biological activities. Monatsh Chem 144, 993–1001 (2013). https://doi.org/10.1007/s00706-012-0916-0

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  • DOI: https://doi.org/10.1007/s00706-012-0916-0

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