In this study, preparation of pyridine-2-carboimine copper complex immobilized on amine-functionalized nanoclay montmorillonite K10 was reported. The products were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and thermogravimetric analysis (TGA). The catalytic activity of this new nanocatalyst, as a natural, renewable, inexpensive, and heterogeneous catalyst, was very effective for the four-component condensation reaction of hydrazine hydrate (or phenyl hydrazine), malononitrile, β-ketoester, and terephthalaldehyde (or isophthalaldehyde) toward the synthesis of multisubstituted bispyrano[2,3-c]pyrazole derivatives. From the viewpoint of green chemistry, the advantages of this approach are accessibility, simplicity, and high yields synthesis. The catalyst was recycled and reused four times without significant loss of activity.

中文翻译：

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铜 (II) 锚定在胺官能化 MMT 上：一种用于一锅法合成双吡喃并 [2,3-c] 吡唑衍生物的高效催化体系

在这项研究中，报道了在胺官能化纳米粘土蒙脱石 K10 上制备吡啶-2-碳亚胺铜配合物。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、扫描电子显微镜（SEM）、能量色散X射线光谱（EDX）和热重分析（TGA）对产物进行表征。这种新型纳米催化剂作为一种天然的、可再生的、廉价的、非均相催化剂，其催化活性对水合肼（或苯肼）、丙二腈、β的四组分缩合反应非常有效。-酮酯和对苯二醛（或间苯二醛）用于合成多取代的双吡喃并[2,3-c]吡唑衍生物。从绿色化学的角度来看，这种方法的优点是可访问性、简单性和高产率合成。催化剂循环使用四次，活性没有明显损失。