Sulfonic acid-supported vanillin/bis indolylmethane-functionalized Fe₃O₄@SiO₂-propyl NPs as green, effective, and magnetically recoverable catalysts for the synthesis of imidazoquinazolines and thiazoquinazolines

Abstract

Sulfonic acid-supported vanillin/bis indolylmethane-functionalized Fe₃O₄@SiO₂-Propyl NPs were prepared and characterized by FT-IR, XRD, FE-SEM, TEM, VSM, EDX, DLS, and TGA-DTG. The catalytic efficiency of the prepared nanoparticles was subsequently investigated for the effective synthesis of imidazoquinazolines via the one-pot condensation of 2-aminobenzimidazole, aryl aldehydes, and cyclohexanone or dimedone under solvent-free condition. Some thiazoquinazolines also were prepared via the multicomponent reaction of aldehydes, dimedone, and 2-aminobenzothiazol under solvent-free condition,. This avenue is really suitable because it makes a high yield of product, doesn’t take too long, doesn’t need harmful materials and solvents, its work-up is easy and the catalyst is reusable.

GRAPHICAL ABSTRACT

KEYWORDS:

• Sulfonic acid-supported vanillin/bis indolylmethane-functionalized Fe3O4@SiO2-propyl NPs
• imidazoquinazolines
• thiazoquinazolines
• dimedone
• green synthesis

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Acknowledgement

We are thankful fof the Payame Noor University of Rasht branch.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

There are data associated with this manuscript.