Green preparation of tetrahydrobenzimidazo[2,1-b]quinazolin-1(2H)-ones using γ-Fe2O3@KSF as novel and recyclable magnetic catalyst

Document Type: Research Paper


Department of Chemistry, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran



The preparation of tetrahydrobenzimidazo[2,1-b]quinazolin-1(2H)-ones via a γ-Fe2O3@KSF-catalyzed multicomponent coupling reaction of 2-aminobenzimidazole, benzaldehydes, and dimedone in solvent-free conditions is reported. γ-Fe2O3@KSF as a magnetic catalyst was prepared using the successive coating of a γ-Fe2O3 shell on a KSF core and was characterized by different methods including FT-IR, XRD, TGA and SEM techniques. The merits of this method include limited use of organic solvents, excellent purity of products, and an easy workup technique. The tetrahydrobenzimidazo[2,1-b]quinazolin-1(2H)-ones were prepared in yields of 88-94%. The catalyst was recovered through an external magnet and reused four times without any considerable loss of its activity.

Graphical Abstract

Green preparation of tetrahydrobenzimidazo[2,1-b]quinazolin-1(2H)-ones using γ-Fe2O3@KSF as novel and recyclable magnetic catalyst


  • The preparation of quinazolins by γ-Fe2O3@KSF-catalyzed reactions of 2-aminobenzimidazole, benzaldehydes and dimedone is reported.
  • The catalyst was prepared using the successive coating of γ-Fe2O3 shell on KSF core.
  • Using γ-Fe2O3@KSF offers advantages, including easy workup, high yields, reusability, no by-products and efficient product separation.


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