Abstract
Novel ionic liquid sulfonic acid pyridinium hydrogen sulfate ([Pyridine-SO3H]HSO4) is synthesized and characterized by various techniques such as FT-IR, 1H NMR, 13C NMR, TG, DTG, as well as mass spectra. This ionic liquid is used as an efficient, homogeneous, and recyclable catalyst for one-pot synthesis of highly functionalized tetrahydropyridines from the three-component condensation of aromatic aldehydes, ethyl acetoacetate, and substituted anilines under solvent-free conditions. The main advantages of this protocol are the short reaction time, high yields, mild and clean conditions, and several reuse times without noticeably decreasing the catalytic activity.
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The authors acknowledge Islamic Azad University of Lamerd for support of this work.
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Mohammadi, S., Abbasi, M. Design of ionic liquid sulfonic acid pyridinium hydrogen sulfate as an efficient, eco-friendly, and reusable catalyst for one-pot synthesis of highly functionalized tetrahydropyridines. Res Chem Intermed 41, 8877–8890 (2015). https://doi.org/10.1007/s11164-015-1934-4
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DOI: https://doi.org/10.1007/s11164-015-1934-4