Pyridine-4-carboxylic acid (PYCA) functionalized Fe3O4 nanoparticles as an organic–inorganic hybrid heterogeneous catalyst was fabricated and characterized by FT-IR, XRD, TGA, TEM, SEM, and VSM techniques. The catalytic activity of the magnetic catalyst was probed through one-pot synthesis of pyrano[3,2-b]pyranone derivatives from three component reactions of aromatic aldehydes, kojic acid, and ethyl cyanoacetate under solvent-free conditions. Some advantages of this protocol are its environmentally benign method, simple procedure, high yields, and short reaction time. The catalyst was readily separated using an external magnet and reusable without significant loss of its catalytic efficiency.
吡啶-4-
羧酸 (PYCA) 功能化
Fe3O4 纳米颗粒作为有机-无机杂化非均相催化剂的制备和表征通过 FT-IR、XRD、TGA、
TEM、
SEM 和 VSM 技术。通过在无溶剂条件下由芳香醛、
曲酸和
氰乙酸乙酯三组分反应一锅法合成
吡喃并[3,2-b]
吡喃酮衍
生物,探讨了磁性催化剂的催化活性。该方案的优点是方法环境友好、程序简单、产率高、反应时间短。该催化剂可以使用外部磁
铁轻松分离,并且可以重复使用,而不会显着损失其催化效率。