An N-Heterocyclic Carbene-Nickel Half-Sandwich Complex as a Precatalyst for Suzuki–Miyaura Coupling of Aryl/Heteroaryl Halides with Aryl/Heteroarylboronic Acids

A nickel half-sandwich complex supported by our original NHC ligand was developed as a robust precatalyst for Suzuki–Miyaura cross-coupling. The addition of PPh3 was a crucial element in the suppression of side reactions and in accelerating the cross-coupling reaction. By employing the optimal conditions, aryl–aryl, heteroaryl–aryl, and heteroaryl–heteroaryl couplings were achieved.