Copper-Catalyzed Asymmetric Borylallylation of Vinyl Arenes

A copper-catalyzed, enantioselective method for the borylallylation,of vinyl arenes is reported. The reaction produces enantioenriched and functiorialized organoboron-compounds by sequentially incorporating boryl, and ally: groups onto the C=C bond of vinyl arenes. Copper-catalyzed borylative coupling of vinyl arenes with ally phosphates successfully proceeds in a regio- and enantioselective manner in the absence of a palladium cocatalyst.