Iron‐Catalyzed CH Functionalization of Heterocycles

Abstract Transition metal‐catalyzed CH functionalization/CH bond activation is established as a standard protocol for the construction of new CC and C–heteroatom bonds, both in industries and in academia. But most of the methods are associated with the use of toxic and costly metals along with the generation of hazardous chemical as by‐products. Thus, in need of environmentally benign and sustainable methodology, iron‐catalyzed CH bond functionalization has gained much attention in recent times. Therefore, selective functionalization of heterocycles could be an easy method to access heterocyclic compounds which have applications in the fine chemical industry, medicinal chemistry, etc. In this article, we focused on the recent developments in CH bond functionalization of heterocycles using earth‐abundant iron salts toward the construction of carbon–carbon and carbon–heteroatom bonds.