Chiral Proline-Based P,O and P,N Ligands for Iridium-Catalyzed Asymmetric Hydrogenation
作者:Denise Rageot、Andreas Pfaltz
DOI:10.1002/hlca.201200437
日期:2012.11
of proline‐basedP,O and P,N ligands were prepared and applied in the iridium‐catalyzed asymmetric hydrogenation of alkenes. Both types of ligands induced high enantioselectivities in the hydrogenation of trisubstituted CC bonds. Iridium complexes derived from P,O ligands bearing sterically demanding amide or urea groups at the pyrrolidine N‐atom proved to be especially efficient catalysts for the conjugate