An approach to chiral metal catalysts; the synthesis and X-ray crystal structures of a chiral tetradentate binaphthyl bis-amide ligand and its osmium(VI)-oxo derivative
The synthesis of enantiomerically pure C 2-symmetric bis-pyridinium salts was realized through a simple condensation of 2-pyridyl-carboxyaldehydes with a chiral diamine. The catalytic properties of such novel compounds were preliminarily studied and the trifluoracetate salts of chiral bis-imines of 2-picolinaldehydes derivedfrom1,1′-binaphthyl-2,2′-diamine were shown to catalyze the Diels-Alder reaction