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  • Title: Cerium ammonium nitrate (CAN)-catalyzed four-component one-pot synthesis of multi-substituted pyrano[2,3-c] pyrazoles under ultrasound irradiation.
    Author: Ablajan K, Liju W, Kelimu Y, Jun F.
    Journal: Mol Divers; 2013 Nov; 17(4):693-700. PubMed ID: 23918005.
    Abstract:
    A convenient and efficient synthesis of multi-substituted dihydropyrano[2,3-c]pyrazole derivatives is reported. The four-component reaction of 4-hydrazinobenzoic acid, β-keto esters, aromatic aldehydes, and malononitrile using 10 mol% CAN catalyst in water under ultrasound irradiation produced the target compounds in good-to-excellent yields. This method has advantages over conventional methods in being economic, non-toxic, and environmentally compatible due to its use of efficient and eco-friendly CAN catalyst and water solvent.
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