Aza-bis(oxazolines): New chiral ligands for asymmetric catalysis

GRAPHICS Aza-bis(oxazolines) are introduced as chiral ligands for asymmetric catalysis combining the advantages of easy availability of bis(oxazolines) and backbone variability of aza-semicorrins. Especially, the title ligands could be attached to a polymeric support, which allowed the development of easily recoverable copper(I) catalysts for asymmetric cyclopropanation reactions.