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<p>An immobilized novel ornamental nanocatalyst is synthesized with core magnetically active Fe<sub>3</sub>O<sub>4</sub> and coated with photo-catalytically active TiO<sub>2</sub><b>,</b> which is stabilized by silylation using the APTES and orthophosphoric acid salt formation, enhancing the stability, acidity, variety of analytical studies, including FT-IR, XRD, EDAX, FESEM with EDX image mapping, HRTEM, VSM and TAG-DSC, verify the catalyst's formation. The produced catalyst is effectively applied for one-pot three-component synthesis of biologically active species, spirooxindole and dihydropyrano[c]chromenes derivatives at 80–85&#xa0;°C temperature in universal-green solvent (i.e., water–ethanol), and synthesized compounds were characterized and confirmed by the spectral analysis <sup>1</sup>H, <sup>13</sup>C NMR<b>,</b> and high-resolution mass spectroscopy. The main advantages of the current procedure are the straightforward isolation of the products, high atom economy<b>,</b> and avoidance of potentially dangerous organic solvents, the catalyst's flexibility, and its simple separation. There was no noticeable difference in the catalyst's selectivity or effectiveness even after five cycles of recovery. From a green chemistry orientation, a sustainable environment of the catalyst, easy recovery and reusability, high catalytic activity, and thermal stability make the strategy particularly appealing.</p> Graphical Abstract <p></p>

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Catalytic application of nano-Fe3O4@TiO2-APTES-OPA catalyst in one-pot synthesis of dihydropyrano[c]chromenes and spirooxindole derivatives in water–ethanol system

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • Sajid Pinjari,
  • Ramesh Dateer,
  • Gopinath Shirole,
  • Dilip Aute,
  • Bhagwat Uphade,
  • Anil Gadhave

摘要

An immobilized novel ornamental nanocatalyst is synthesized with core magnetically active Fe3O4 and coated with photo-catalytically active TiO2, which is stabilized by silylation using the APTES and orthophosphoric acid salt formation, enhancing the stability, acidity, variety of analytical studies, including FT-IR, XRD, EDAX, FESEM with EDX image mapping, HRTEM, VSM and TAG-DSC, verify the catalyst's formation. The produced catalyst is effectively applied for one-pot three-component synthesis of biologically active species, spirooxindole and dihydropyrano[c]chromenes derivatives at 80–85 °C temperature in universal-green solvent (i.e., water–ethanol), and synthesized compounds were characterized and confirmed by the spectral analysis 1H, 13C NMR, and high-resolution mass spectroscopy. The main advantages of the current procedure are the straightforward isolation of the products, high atom economy, and avoidance of potentially dangerous organic solvents, the catalyst's flexibility, and its simple separation. There was no noticeable difference in the catalyst's selectivity or effectiveness even after five cycles of recovery. From a green chemistry orientation, a sustainable environment of the catalyst, easy recovery and reusability, high catalytic activity, and thermal stability make the strategy particularly appealing.

Graphical Abstract