The developments of hydrogensources stand at the forefront of asymmetric reduction. In contrast to the well-studied alcohols as hydrogensources via β-hydride elimination, the direct utilization of the proton of alcohols as a hydrogensource for activator-mediated asymmetric reduction is rarely explored. Herein we report the proton of alcohols as a hydrogensource in diboron-mediated palladium-catalyzed
quaternary stereocenter with high enantioselectivity and diastereoselectivity. Mechanistic studies and DFT calculations suggested that the rarely observed diastereoselectivity reversal is ascribed to the charge-charge interaction between the palladium and aromatic ring of the substrate, which could not only result in the reversal of the diastereoselectivity, but also improve the reactivity.