ZrCl4/[bmim]BF4‐catalyzed condensation of salicylaldehydes and malononitrile: Single‐step synthesis of 3‐cyanocoumarin derivatives |
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| Authors: | Hassan Valizadeh Manzar Mahmoodian Hamid Gholipour |
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| Institution: | Department of Chemistry, Faculty of Sciences, Azarbaijan University of Tarbiat Moallem, Tabriz, Iran |
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| Abstract: | A versatile and efficient single‐step route to 3‐cyanocoumarins via Knoevenagel condensation of salicylaldehydes and malononitrile using ZrCl4 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. J. Heterocyclic Chem., (2011). |
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