system involving Er(III)-based chiral Lewisacid catalysis, Ir(III)-based photoredox catalysis, and bromide-radical-mediated hydrogen atom transfer. The introduction of a bulky and nonredox chiral Lewisacid through the photoredox pathway enables the radical addition process and inhibits the above competitive reactions. The visible-light-promoted catalytic asymmetric alkylation of heteroaryl-based ketones