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A Cu-catalyzed regioselective and stereospecific aminoboration of styrenes with bis(pinacolato)diboron and O-benzoyl-N,N-dialkylhydroxylamines that delivers the corresponding β-aminoalkylboranes in good yields has been developed. The Cu catalysis enables introduction of both amine and boron moieties to C-C double bonds simultaneously in a syn fashion. Moreover, the use of a chiral biphosphine ligand, (S,S)-Me-Duphos, provides a catalytic enantioselective route to optically active β-aminoalkylboranes.
Matsuda et al. (Fri,) studied this question.