highly effectual synthesis of 4h-pyrano [2, 3-c] pyrazoles using n1, n1, n2, n2-tetramethyl-n1, n2-bis (sulfo) ethane-1, 2-diaminium trifluoroacetate as a dual-functional catalyst

In this research study, highly effective preparation of 4h-pyrano[2, 3- c]pyrazoles was discussed. the one-pot multi-component reaction between the malononitrile, arylaldehydes and 3-methyl-1-phenyl-1h-pyrazol-5 (4h)- one using protic acidic ionic liquid n1, n1, n2, n2-tetramethyl-n1, n2-bis (sulfo) ethane-1, 2-diaminium trifluoroacetate ([tmbsed][tfa]2) under the mild and solvent-free conditions have furnished the title compounds with high yields in short times. additionally, an attractive mechanism considering dual-functionality of the catalyst was proposed ([tmbsed][tfa]2 with acidic and basic sites).