An Efficient One-Pot Synthesis of Bis-Indolylmethanes Containing Pyrazolyl Catalyzed by Bronsted Acidic Ionic Liquid Under Solvent-Free Conditions

[摘要]：Bronsted acidic ionic liquid [PyNCH(2)CO(2)H][HSO(4)] was found to be an effective catalyst for the condensation reactions of indoles with various 4-formylpyrazoles to afford the corresponding bis-indolylmethanes containing pyrazole under solvent-free conditions. The satisfactory results were obtained with excellent yields, short reaction time, and simplicity in the experimental procedure.

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