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Recent Advances in Transition Metal-Catalyzed Cross-Coupling Reactions Directly Promoted by Visible Light

Over the last decades, the transition metal-catalyzed cross-coupling reactions have become powerful organic synthetic methods for forming carbon-carbon and carbon-heteroatom bonds. Very recently, the introduction of visible light into transition metal catalysis opened a new avenue for achieving novel, highly enabling cross-coupling reactions that otherwise were elusive. This type of reaction has received extensive attention due to its simple, mild conditions and no need of photo-catalyst. Based on the classification of transition metals, the research progress of transition metal-catalyzed cross-coupling reactions directly promoted by visible light is reviewed.