Changing the Palladium Coordination to Phosphinoimidazolines with a Remote Triazole Substituent
作者:Verónica de la Fuente、Rocío Marcos、Xacobe C. Cambeiro、Sergio Castillón、Carmen Claver、Miquel A. Pericàs
DOI:10.1002/adsc.201100684
日期:2011.12
Phosphinoimidazoline (PHIM) ligands bearing a triazolylmethyl substituent at the sp3 nitrogen atom in the imidazoline ring lead to highly improved enantioselectivity (up to 99% ee) in allylic substitution reactions with respect to analogous ligands with substituents lacking the triazole unit. NMR and theoretical studies support a shift in the coordination mode of the PHIM ligand to palladium, triggered