An umpolung mechanism of B(pin)-mediated Cu/B rearrangement and origin of regioselectivity for NHC-Cu-catalyzed allylation of imines

An umpolung mechanism of B(pin)-mediated Cu/B rearrangement in copper-catalyzed selective allylation of imines, and the effect of the substituent in the C 1 site of allyl and its conformation on the regioselectivity of the reaction.