Iron-catalyzed intermolecular and intramolecular cyclization reactions of N-heterocycles

N-Heterocyclic compounds have been appealing pharmacophores in their use as drug production substrates. In this review paper, the cyclization of N-heterocycles, using iron as a catalyst, and their mechanistic pathways have been highlighted and presented comprehensively. This paper will provide researchers with in-depth knowledge of their approach to synthesis by employing a greener way rather than a conventional one. The present review firmly establishes that iron catalysts by their innate ability and inherent potential to acquire the four oxidation states coupled with their easy accessibility, inexpensive, and environment-friendly nature have remained the mainstay in chemistry as the evergreen catalyst in the domain of organic synthesis. This review paper extensively explores iron-catalyzed cyclization of N-heterocycles, elucidating mechanistic pathways and emphasizing greener synthesis methods. Iron's versatility, accessibility, and eco-friendliness solidify its position as a cornerstone in organic synthesis.