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
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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.
Keywords
One-pot Sulfonic acid pyridinium hydrogen sulfate Tetrahydropyridines Solvent-free conditions Multicomponent reactionNotes
Acknowledgments
The authors acknowledge Islamic Azad University of Lamerd for support of this work.
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