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| An environmentally friendly synthesis of 1,4-dihydropyrano [2,3-c]pyrazole derivatives catalyzed by tungstate sulfuric acid |
| Mahnaz Farahi, Bahador Karami, Iman Sedighimehr, Hamideh Mohamadi Tanuraghaj |
| Department of Chemistry, Yasouj University, Yasouj 75918-74831, Iran |
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Abstract An efficient three-component synthesis of 6-amino-4-aryl-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazoles via a reaction between 3-methyl-1-phenyl-2-pyrazolin-5-one, aromatic aldehydes and malononitrile using tungstate sulfuric acid as a catalyst was described. Mild conditions, good to excellent yields, easily available catalyst and easy work-up are the key features of this method.
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Received: 27 May 2014
Published: 23 July 2014
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Corresponding Authors:
Bahador Karami
E-mail: karami@yu.ac.ir
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