Silica-bound phosphoric acid (SiO2–OPO3H), as an eco-friendly, reusable, and heterogeneous catalyst, was applied for synthesis of 2-substituted benzimidazoles in water at 70°C. Very short reaction times, clean work-up, and high yields are among the advantages of this protocol.
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The Research Council of Yazd University is gratefully acknowledged for financial support of this work.
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Published in Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 41-46, 2014.
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Mirjalili, B.F., Bamoniri, A. & Rahimi Kazerouni, M. One-Pot Synthesis of Benzimidazoles in Water in the Presence of SiO2–OPO3H. Chem Heterocycl Comp 50, 35–40 (2014). https://doi.org/10.1007/s10593-014-1445-z
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DOI: https://doi.org/10.1007/s10593-014-1445-z