ZrCl(4)/[bmim]BF(4)-Catalyzed Condensation of Salicylaldehydes and Malononitrile: Single-Step Synthesis of 3-Cyanocoumarin Derivatives

[摘要]：A versatile and efficient single-step route to 3-cyanocoumarins via Knoevenagel condensation of salicylaldehydes and malononitrile using ZrCl(4) as the catalyst (15 mol %) in ionic liquid 1-(n-butyl)-3-methylimidazolium tetrafluoroborate as reaction medium and catalyst is described. The novel procedure features single step, short reaction time, good yields, and simple workup.

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