Abstractmagnified imageA proline‐derived aminohydroxyphosphine ligand induced excellent regio‐ and enantioselectivities (SN2′:SN2>94:6, 94–97% ee) in the copper‐catalyzed substitution reaction of cinnamyl phosphates with Et2Zn. A computational modelling study of the reaction pathway suggests that the displacement of the leaving group takes place in an ordered, anti‐fashion through simultaneous copper–olefin and zinc–oxygen interactions, which is critical for the enantioselection.