Cobalt-catalyzed hydrogenation of β-enamino esters using an internal mixture of bidentate and monodentate ligands
作者:Manuel Amézquita-Valencia、Armando Cabrera
DOI:10.1016/j.jorganchem.2014.06.028
日期:2014.10
Different beta-amino esters have been obtained in good yields by means of octacarbonyldicobalt-catalyzed hydrogenation of beta-enamine esters in the presence of mixture of a bidentate phosphine chiral (R-BINAP) and a monodentate phosphine achiral (PPh3). Likewise, a non-symmetric Co/BINAP/PPh3 complex was isolated. This new compound was used in the hydrogenation reaction under different conditions and the results suggest that this heterocombination could be responsible for improving enantiomeric excess in the reduction products. (C) 2014 Elsevier B.V. All rights reserved.