Palladium-Catalyzed Olefination of Aryl C-H Bonds by Using Directing Scaffolds

Site selective C-H bond activation/C-C bond formation is an ideal target for organic chemists owing to the ubiquitous nature of C-H bonds in natural products. A particular aryl C-H bond can be predictably activated by a directing group. However, the majority of strong and weak coordinating directing groups have been implemented for ortho-C-H bond activation/C-alkenylation. More recently, meta-C-H functionalization has been promoted by fine-tuning directing templates. In this short review, we have summarized recent progress in palladium-catalyzed directing group/template-assisted ortho/meta-C-H olefination.