Journal
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
Volume 68, Issue 5, Pages 888-892Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jccs.202000011
Keywords
2‐ amino‐ 4‐ H‐ pyran; 3‐ acetylcoumarin; aromatic aldehydes; ethyl cyanoacetate; malononitrile
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Funding
- Yasouj University, Yasouj, Iran
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In this study, 2-amino-4H-pyran derivatives were synthesized using tungstate sulfuric acid as a recyclable solid acid catalyst, demonstrating good to excellent yields under mild conditions. The catalyst proved to be low-cost, non-toxic, and reusable, with the ability to maintain its activity over multiple cycles of use.
2-Amino-4H-pyran-3-carbonitriles and 2-amino-4H-pyran-3-carboxylate derivatives were synthesized under mild conditions in the presence of tungstate sulfuric acid (TSA) as a recyclable solid acid catalyst. Catalytic condensation between 3-acetylcoumarin, aromatic aldehydes, and malononitrile or ethyl cyanoacetate gave the 2-amino-4H-pyran derivatives. Tungstate sulfuric acid is a low-cost, nontoxic, and reusable catalyst, which does not require very high temperatures and good to excellent yields were obtained in all cases. The catalyst can be reused for many times without significant loss of its activity.
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