One-Pot Synthesis of Polyfunctionalized Pyrans Catalyzed by Basic Ionic Liquid in Aqueous Media

[摘要]：An efficient and convenient method for the synthesis of polyfunctionalized 4H-pyrans has been achieved through the one-pot condensation of aromatic aldehydes, malononitrile, and 4-hydroxycoumarin, phenols or active methylene carbonyl compounds such as 1, 3-cyclohexanedione and dimedone in the presence of 1-butyl-3-methyl imidazolium hydroxide ([bmim]OH) as catalyst in aqueous media. This method offers several advantages short reaction time, high yields, and simple procedure.

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