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<p>A nanomagnetic catalyst γ-Fe<sub>2</sub>O<sub>3</sub>@SiO<sub>2</sub>-linker-L-histidine was prepared and characterized by SEM, FT-IR, TGA, VSM, and EDX analyses. A convenient and facile method was reported for the <i>pseudo</i>-four-component&#xa0;reaction of malononitrile (2&#xa0;mmol), aromatic aldehydes (1&#xa0;mmol), 2′-hydroxyacetophenone derivatives (1&#xa0;mmol) in the presence of γ-Fe<sub>2</sub>O<sub>3</sub>@SiO<sub>2</sub>-linker-L-histidine as a nonocatalyst in water as a green solvent. The desired chromeno[1,6]naphthyridines were efficiently formed&#xa0;in high yields&#xa0;and relatively shorter&#xa0;reaction times. The simple reaction, and easy work-up procedure are the advantages of this protocol. The γ-Fe<sub>2</sub>O<sub>3</sub>@SiO<sub>2</sub>-linker-L-histidine nanocatalyst was readily recovered by external magnetic field and can be reused at least five cycles without considerable loss in catalytic activity.</p> Graphical abstract <p></p>

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The synthesis of γ-Fe2O3@SiO2-L-histidine as a magnetic nanocatalyst for the preparation of new chromeno[1,6]naphthyridine derivatives

  • 期刊论文

  • 发表日期：

    2025年2月23日

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  • Mojdeh Shojaei,
  • Hamid Fallahi,
  • Farhad Shirzaei,
  • Hamid Reza Shaterian

摘要

A nanomagnetic catalyst γ-Fe2O3@SiO2-linker-L-histidine was prepared and characterized by SEM, FT-IR, TGA, VSM, and EDX analyses. A convenient and facile method was reported for the pseudo-four-component reaction of malononitrile (2 mmol), aromatic aldehydes (1 mmol), 2′-hydroxyacetophenone derivatives (1 mmol) in the presence of γ-Fe2O3@SiO2-linker-L-histidine as a nonocatalyst in water as a green solvent. The desired chromeno[1,6]naphthyridines were efficiently formed in high yields and relatively shorter reaction times. The simple reaction, and easy work-up procedure are the advantages of this protocol. The γ-Fe2O3@SiO2-linker-L-histidine nanocatalyst was readily recovered by external magnetic field and can be reused at least five cycles without considerable loss in catalytic activity.

Graphical abstract