Copper(II)/polyimide linked covalent organic framework as a powerful catalyst for the solvent‐free microwave irradiation‐based synthesis of 2,4,5‐trisubstituted imidazoles

Copper(II)/polyimide-linked covalent organic frameworks under solvent-free and microwave-assisted conditions have been used in an efficient one-pot protocol for the preparation of 2,4,5-trisubstituted imidazoles via benzil, aromatic aldehydes ammonium acetate. By applying microwave irradiation, three-component condensation provides safe operations, low pollution, quick access to products, easy set-up. As a result its reusability, catalyst can also be reutilized many runs without missing any activity.