Iron‐Based Nanoparticle‐Catalyzed Solvent‐Free Strategies for the Synthesis of Imidazole Scaffolds: Progress and Perspectives

The quest for green synthetic techniques has emerged as a prominent subject, notably in the synthesis of heterocycles that are biologically significant. Imidazole scaffolds are an important class of nitrogen‐containing compounds that have a wide range of applications. The conventional synthetic protocols for imidazole derivatives rely on potentially harmful solvents, homogeneous catalysts, and harsh conditions. Iron‐based nanoparticles have been introduced as efficient, low‐cost, and green catalytic systems as a result of recent advancements in nanocatalysis; their application in solvent‐free conditions is still relatively underexplored. Solvent‐free iron‐based nanocatalytic systems have emerged as a promising green option because they offer high efficiency, operational simplicity, and reduced environmental impact. The purpose of this study is to provide a comprehensive summary of recent advances in the field of iron‐based nanoparticle‐catalyzed synthesis of imidazole scaffolds, with a particular focus on solvent‐free reaction methods. There is a critical discussion and comparison with existing approaches about the mechanistic elements, catalyst design, substrate scope, reaction efficiency, and recyclability of the material.