Synthesis of Planar Chiral Ferrocenes by Transition‐Metal‐Catalyzed Enantioselective C−H Activation

Abstract This minireview focuses on recent advancements in the synthesis of planar chiral ferrocenes by means of transition‐metal‐catalyzed enantioselective C−H activation. Enantioenriched planar chiral ferrocenes are synthesized through simple straightforward asymmetric carbon−carbon or carbon−heteroatom bond‐formation reactions. In these reports, site selectivity of ferrocene C−H activation is controlled by two strategies, coordination direction and intramolecular cyclization. Herein the significance of these results is summarized.