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Synthesis of bioactive heterocyclic compounds comprising pyrrolidinone linked to a benzimidazole moiety by an eco-friendly and efficient route was investigated. The targeted scaffolds were synthesized from substituted arylamines and available  o -phenylenediamine under ultrasonic irradiation in the presence of a mixture of a deep eutectic solvent (DES) and hierarchical TiO 2  (H-TiO 2 ) microspheres as a green catalytic system. Two DESs were synthesized by separately mixing FeCl 2  and CuCl 2  with urea. On the other hand, hierarchical TiO 2  (H-TiO 2 ) was synthesized by a solvothermal route and characterized by XRD, SEM, Raman spectroscopy, and XPS. The results demonstrate that the best reaction yields are obtained by using H-TiO 2  microspheres in the DES. Besides, the synthesized compounds were screened for their antibacterial activity against different bacteria. Overall, eight derivatives were confirmed to exhibit antibacterial activity.

polycyclic aromatic compounds

Synergistic Catalytic Effect of the Combination of Deep Eutectic Solvents and Hierarchical H-TiO 2  Nanoparticles toward the Synthesis of Benzimidazole-Linked Pyrrolidin-2-One Heterocycles: Boosting Reaction Yield