New pinene-derived pyridines as bidentate chiral ligands
作者:Andrei V. Malkov、Angus J.P. Stewart-Liddon、Filip Teplý、Lukáš Kobr、Kenneth W. Muir、David Haigh、Pavel Kočovský
DOI:10.1016/j.tet.2008.02.045
日期:2008.4
β-pinene 11. A copper complex of the pyridine–oxazoline ligands 8a has been found to catalyze asymmetric allylic oxidation of cyclic olefins 36a–c with good conversion rates and acceptable enantioselectivity (≤67% ee). The imidazolium salt 10 has been identified as a precursor of the corresponding N,N′-unsymmetrical N-heterocyclic carbene ligand, whose complex with palladiumcatalyzed the intramolecular