Copper/Bisphosphine Catalysts in the Internally Borylative Aminoboration of Unactivated Terminal Alkenes with Bis(pinacolato)diboron
作者:Kodai Kato、Koji Hirano、Masahiro Miura
DOI:10.1021/acs.joc.7b01874
日期:2017.10.6
Cu(I)/modified dppbz catalyst systems for the regioselective aminoboration of unactivated terminalalkenes have been developed. The bisphosphine-based Cu catalysis enables the introduction of the readily transformable Bpin group at the more congested internal position and shows better regioselectivity for broader terminalalkenes involving sterically demanding allylbenzenes, which are relatively challenging
Regioselective and Stereospecific Copper-Catalyzed Aminoboration of Styrenes with Bis(pinacolato)diboron and <i>O</i>-Benzoyl-<i>N</i>,<i>N</i>-dialkylhydroxylamines
A Cu-catalyzed regioselective and stereospecific aminoboration of styrenes with bis(pinacolato)diboron and O-benzoyl-N,N-dialkylhydroxylamines that delivers the corresponding beta-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 beta-aminoalkylboranes.