Advances in Electrochemical Cyclization for the Synthesis of Aza‐Heterocycles

Intramolecular electrochemical cyclization has emerged as an efficient and sustainable strategy for constructing five‐ and six‐membered nitrogen‐containing heterocycles (aza‐heterocycles). This review highlights recent advances in nonmediated electrochemical processes, where substrates undergo direct electron transfer at the electrode, or mediated strategies that employ in situ‐generated redox‐active species to promote selective oxidative activation, providing access to a wide range of aza‐heterocyclic cores under mild and environmentally compatible conditions. Mechanistic insights are discussed to illustrate how electrochemical methods expand the available reactivity for ring cyclization.