Advances in C−N Bond Formation via N‐Centered Radicals from N‐Aminopyridinium Reagents

Nitrogen‐centered radicals (NCRs) have gained significant attention due to their high reactivity, which facilitates many useful and challenging transformations, particularly in the formation of C−N bonds. In this regard, N‐aminopridinium reagents are easily accessible substrates that readily generate N‐centered radicals, which can be trapped by arenes, olefins, alkynes and even alkanes under visible light irradiation. In recent years, amination strategies involving N‐aminopyridinium salts have grown remarkably and attracted considerable interest within the synthetic community. This review comprehensively includes all the significant advances in C−N bond construction via N‐centered radicals derived from N‐aminopyridinium substrates.