A new heterogeneous nanocatalyst containing Cu–dimethylglyoxime complex grafted to an MCM-41 matrix was synthesized. This recoverable nanocomposite was applied as a highly effective, green, thermally stable catalyst in the one-pot reductive cyclization of aromatic aldehydes with 2-aminobenzamide. 2,3-Dihydroquinazolin-4(1H)-ones were obtained in 80–98% yield. The MCM-41-silylcyclopropyl-dimethylglyoxime-Cu heterogeneous nanocomposite was well identified using X‐ray diffraction, field emission scanning electron microscopy, Fourier transform infrared spectroscopy, energy‐dispersive X‐ray spectroscopy, Brunauer–Emmett–Teller technique, and thermogravimetric analysis. The eco-friendly nanocatalyst demonstrated excellent recyclability: it could be reused for at least six successive cycles without any notable decrease in its catalytic function.

Graphic abstract

中文翻译：

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MCM-41基质中Cu-二甲基乙醛肟复合物的锚定：一种新型、可回收、高效的纳米催化剂，用于绿色制备2,3-二氢喹唑啉-4(1H)-酮

合成了一种含有接枝到 MCM-41 基质上的 Cu-二甲基乙醛肟络合物的新型多相纳米催化剂。这种可回收的纳米复合材料在芳香醛与 2-氨基苯甲酰胺的一锅还原环化反应中用作高效、绿色、热稳定的催化剂。2,3-二氢喹唑啉-4(1 H)-ones 以 80-98% 的产率获得。使用 X 射线衍射、场发射扫描电子显微镜、傅里叶变换红外光谱、能量色散 X 射线光谱、Brunauer-Emmett-Teller 技术和热重分析对 MCM-41-甲硅烷基环丙基-二甲基乙醛肟-Cu 异质纳米复合材料进行了很好的鉴定. 环保纳米催化剂表现出优异的可回收性：它可以重复使用至少六个连续循环，其催化功能没有任何显着降低。

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