Organo‐ and Organometallic‐Catalytic Intramolecular [1,5]‐Hydride Transfer/Cyclization Process through C(sp3)–H Bond Activation

The direct functionalization of C(sp³)–H bonds is one of the most synthetically powerful research areas in current organic synthesis. Organocatalytic C(sp³)–H bond activation reactions have recently been developed in addition to the traditional metal‐catalyzed C(sp³)–H activation reactions. In this review, we aim to give a brief overview of organo‐ and organometallic internal redox cascade reactions with respect to the mechanism, the reactivity of hydrogen donors and acceptors, and the migration modes of hydrogen.