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A three-component process for the one-pot synthesis of 6-amino-4-aryl-5-cyano-3-methyl-1- phenyl-1,4-dihydropyrano(2,3-c)pyrazoles from 3-methyl-1-phenyl-2-pyrazolin-5-one, aromatic aldehydes and malononitrile using p-dodecylbenzenesulfonic acid (DBSA) as the catalyst (10 mol %) in aqueous media is described. This method provides several advantages such as mild reaction conditions, simple work-up procedure and is environment friendly. In addition, water is chosen as a green solvent.

An one-pot three-component process for the synthesis of 6-amino-4-aryl-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazoles in aqueous media