A high-yielding, practical, efficient, and environmentally benign one-pot multicomponent synthesis of functionalized 2-amino-4H-pyrans from β-dicarbonyl compounds, malononitrile, and aldehydes is presented. Good to excellent yields were obtained under mild reaction condition and with short reaction times by using magnetite-supported graphitic carbon nitride as a truly recyclable catalyst. This efficient and simple technique avoids the use of solvent extraction and column chromatography. In addition, the catalyst can be easily and effectively recovered and reused several times without significant loss of its catalytic activity.

中文翻译：

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磁性石墨氮化碳催化高效构建功能化4H-吡喃

提出了一种从 β-二羰基化合物、丙二腈和醛类中高产、实用、高效且环境友好的一锅多组分合成功能化 2-氨基-4H-吡喃。通过使用磁铁矿负载的石墨氮化碳作为真正可回收的催化剂，在温和的反应条件和较短的反应时间下获得了良好的产率。这种高效而简单的技术避免了溶剂萃取和柱色谱的使用。此外，催化剂可以轻松有效地回收和重复使用多次，而不会显着降低其催化活性。