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A ligand‐controlled site‐selective C(sp 3 )−H arylation of heteroaromatic ketones has been developed using Pd catalysis. The reaction occurred selectively at the α‐ or β‐position of the ketone side‐chain. The switch from α‐ to β‐arylation was realized by addition of a pyridone ligand. The α‐arylation process showed broad scope and high site‐ and chemoselectivity, whereas the β‐arylation was more limited. Mechanistic investigations suggested that α‐arylation occurs through C−H activation/oxidative addition/reductive elimination whereas β‐arylation involves desaturation and aryl insertion.

Site‐Selective Pd‐Catalyzed C(sp 3 )−H Arylation of Heteroaromatic Ketones