Novel N,S- and N,Se-planar chiral [2,2]paracyclophane ligands: synthesis and application in Pd-catalyzed allylic alkylation

Novel N,S- and N,Se-ligands with planar chirality derived from [2.2]paracyc lophane have been synthesized and applied in palladium-catalyzed allylic al kylation reaction, in which ligands 5 and 9 with the two substituents at be nzylic and benzene ring positions give the highest ee values.