Irradiation-Induced Palladium-Catalyzed Direct C-H Alkylation of Heteroarenes with Tertiary and Secondary Alkyl Bromides

A palladium catalyst in combination with two types of phosphine ligands efficiently catalyzes direct C-H alkylation of heteroarenes with secondary and tertiary alkyl bromides under irradiation conditions. Irradiation of blue light-emitting diodes (blue LEDs) effectively excites phosphine-ligated palladium catalyst to facilitate oxidative addition with alkyl bromides, and also excites the alkylpalladium species to enable the generation of alkyl radicals to react with heteroarenes.