Efficient One-Pot Synthesis of 1,2,4,5-Tetrasubstituted Imidazoles Using GO@SiO₂@[(CH₂)₃Im][Cl] as a Novel...

This study presents the development of a novel nanocomposite catalyst, GO@SiO₂@[(CH₂)₃Im][Cl], for the efficient one-pot synthesis of 1,2,4,5-tetrasubstituted imidazoles under environmentally benign conditions. The catalyst design incorporates graphene oxide, silica, and an imidazolium-functionalized layer, creating a unique catalytic environment for the multicomponent reaction. Thorough characterization of the catalyst was performed using various analytical techniques, including FT-IR, XRD, SEM, TEM, and BET surface area analysis, confirming its successful synthesis and structural integrity. Under optimized solvent-free conditions and microwave irradiation, the reaction proceeds rapidly at room temperature, achieving excellent yields (90%-98%). Notably, the catalyst could be reused for up to seven consecutive cycles with minimal loss of activity and exhibits remarkable efficiency in promoting the four-component condensation of ammonium acetate, a substituted aniline, a substituted benzaldehyde, and benzil to form highly functionalized imidazoles in 18 examples. This sustainable approach represents a significant advancement over traditional methods, which often require harsh conditions, extended reaction times, and generate substantial waste. The use of microwave irradiation, coupled with a solvent-free protocol and room-temperature conditions, aligns perfectly with green chemistry principles. This work provides a practical and sustainable route to important heterocyclic scaffolds. It highlights the potential of rationally designed nanocomposite catalysts in developing more environmentally friendly synthetic processes for complex organic transformations.