Ir(I) complexes with oxazoline-thioether ligands: nucleophilic attack of pyridine on coordinated 1,5-cyclooctadiene and application as catalysts in imine hydrogenation
摘要:
Oxazoline-thioether ligands 6-11 react with [Ir(eta(4)-COD)Py-2]PF6 (COD= C8H12 = 1,5-cyclooctadiene) to give [Ir(sigma-eta(2)-C8H12Py-)L] PF6 (L-oxazoline-thioether ligand) (12a-d) complexes resulted from the coordination of ligand to the metal and subsequent nucleophilic attack of pyridine to one of the double carbon bond of COD with concomitant iridium-carbon bond formation. When [Ir(eta(4)-COD)(2)]BF4 was used as starting material, the reaction with ligands 7, 9 afforded the complexes [Ir(eta(4)-COD)L]BF4. Application of these iridium complexes to the reduction of N-(alpha-methyl)benzylidenbenzylamine gave low or negligible enantioselectivity. (C) 2004 Elsevier B.V. All rights reserved.
Preparation of novel Sulfur and phosphorus containing oxazolines as ligands for asymmetric catalysis
作者:Joanne V. Allen、Graham J. Dawson、Christopher G. Frost、Ionathan M.J. Williams、Steven J. Coote
DOI:10.1016/s0040-4020(01)80795-x
日期:1994.1
The preparation of enantiomerically pure liginds which contain both an oxazoline group and an additional sulfur or phosphorus donor atom are described. Methyithiomethyl, o-thioanisyl and thienyl oxazolines have been prepared in one step, and o-diphenylphosphinophenyl oxazolines have been prepared in two steps in good yields from commercially available starting materials.
Allen, Joanne V.; Coote, Steven J.; Dawson, Graham J., Journal of the Chemical Society. Perkin transactions I, 1994, # 15, p. 2065 - 2072
作者:Allen, Joanne V.、Coote, Steven J.、Dawson, Graham J.、Frost, Christopher G.、Martin, Christopher J.、Williams, Jonathon, M.
DOI:——
日期:——
Enantioselective palladium catalysed allylic substitution with sulfur-containing oxazoline ligands
作者:Christopher G Frost、Jonathan Mj Williams
DOI:10.1016/s0957-4166(00)80417-6
日期:1993.8
Enantiomerically pure sulfur/nitrogen ligands have been prepared in one step from amino alcohols and 2-(methylthio)benzonitrile. We have successfully employed these ligands for enantioselective palladium catalysed allylic substitution, with asymmetric induction of up to 80% ee.
Allen Joanne V., Dawson Graham J., Frost Christopher G., Williams Jonatha+, Tetrahedron, 50 (1994) N 3, S 799-808
作者:Allen Joanne V., Dawson Graham J., Frost Christopher G., Williams Jonatha+