1-Phosphino-2-sulfenylferrocenes as Planar Chiral Ligands in Enantioselective Palladium-Catalyzed Allylic Substitutions
作者:Olga García Mancheño、Julián Priego、Silvia Cabrera、Ramón Gómez Arrayás、Tomás Llamas、Juan Carlos Carretero
DOI:10.1021/jo0340657
日期:2003.5.1
1-phosphino-2-sulfenylferrocene ligands 1 possessing exclusively planar chirality is described. In the case of the readily available tert-butylsulfenyl derivatives very high enantioselectivities were obtained in the palladium-catalyzedallylicsubstitution of 1,3-diphenyl-2-propenyl acetate with dimethyl malonate (ee's up to 97%) and nitrogen nucleophiles (ee's up to 99.5%). Palladium complexes of these ferrocenes
Kinetic Study of Various Phosphoramidite Ligands in the Iridium-Catalyzed Allylic Substitution
作者:Damien Polet、Alexandre Alexakis
DOI:10.1021/ol050350w
日期:2005.4.14
[reaction: see text] A comparative kineticstudy of seven ligands is presented which clearly shows that a slight difference in the substitution pattern of the aryl group on the amine moiety of the ligand dramatically alters the activity of the resulting iridium catalyst. Ligand L6 shows the most impressive kinetics as well as the highest enantioselectivities.
Crown-ether functionalised second coordination sphere palladium catalysts by molecular imprinting
作者:Florian Viton、Peter S. White、Michel R. Gagné
DOI:10.1039/b309072h
日期:——
Functionalisation of the second coordination sphere of a molecularly imprinted Pd complex was achieved by localising within the polymeric cavity a crown-ether receptor capable of altering the catalytic activity of the reactivesite.
New chiral phosphole ligands: their coordination behaviour and application in palladium-catalysed asymmetric allylic substitution
作者:Jérôme Hydrio、Maryse Gouygou、Frédéric Dallemer、Jean-Claude Daran、Gilbert G.A. Balavoine
DOI:10.1016/s0957-4166(02)00256-2
日期:2002.6
Newchiral 1-pyrrolidinophosphole ligands have been synthesised. These phospholes behave as monodentate ligands towards transition metal centres giving mononuclear disubstituted phosphole complexes of the type [M(phosphole)2Cl2] with palladium(II) and platinum(II) precursors. In the palladium-catalysed asymmetricallylicsubstitution of 1,3-diphenyl-2-enylacetate with the anion of dimethylmalonate