Abstract A series of substituted 4H-pyrans derivatives were synthesized by a one-pot, multi-component reaction of aromatic aldehydes, malononitrile, and pyrazolone derivatives or active methylene carbonyl compounds such as dimedone, in the presence of 1,3-dimethyl imidazolium dimethyl phosphate [DMImd-DMP] as a catalyst in aqueous ethanol. Recyclability of the catalyst, high yields, simple product isolation and high atom economy are the noteworthy aspects of this protocol.

中文翻译：

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[DMIMd-DMP]：一种高效且可重复使用的催化剂，用于合成 4H-苯并[b]吡喃衍生物

摘要 以芳香醛、丙二腈和吡唑啉酮衍生物或活性亚甲基羰基化合物如二甲酮为原料，在1,3-二甲基咪唑鎓二甲基吡啶存在下，通过一锅多组分反应合成了一系列取代的4H-吡喃衍生物。磷酸盐 [DMImd-DM​​P] 作为乙醇水溶液中的催化剂。催化剂的可回收性、高产率、简单的产品分离和高原子经济性是该协议值得注意的方面。