Efficient Enantioselective Synthesis of 3-Aminochroman Derivatives Through Ruthenium-Synphos Catalyzed Asymmetric Hydrogenation
作者:Zi Wu、Tahar Ayad、Virginie Ratovelomanana-Vidal
DOI:10.1021/ol201786q
日期:2011.8.5
A highly enantioselective asymmetric hydrogenation of various trisubstituted enamides derived from chroman-3-ones promoted by cationic Ru-Synphos catalysts is reported. This atom-economical and clean method provides an efficient route to optically active 3-aminochroman derivatives, which are important pharmacophores found in numerous drug candidates, in high chemical yields and enantiomeric excesses up to 96%.
Rhodium‐Catalyzed Asymmetric Hydrogenation of 3‐Benzoylaminocoumarins for the Synthesis of Chiral 3‐Amino Dihydrocoumarins
An asymmetrichydrogenation of 3-benzoylaminocoumarins was achieved for the first time using our BridgePhos-Rh catalytic system, providing chiral 3-amino dihydrocoumarins in high yields (up to 98 %) and with excellent enantioselectivities (up to 99.7 % ee). The relationship between the enantioselectivities of the hydrogenations and the dihedral angles and the resulting π-π stacking effects of the BridgePhos-Rh