Matching the Chirality of Monodentate N-Heterocyclic Carbene Ligands: A Case Study on Well-Defined Palladium Complexes for the Asymmetric α-Arylation of Amides
N-Heterocyclic carbeneligands derived from C(2)-symmetric diamines with naphthyl side chains are introduced as chiral monodentate ligands, and their palladium complexes (NHC)Pd(cin)Cl are prepared. These compounds exist as a mixture of diastereomers, and the palladium complexes can be successfully separated and their absolute stereochemistry assigned. When used in the asymmetricintramolecular alpha-arylation
Investigation of the complexation behaviour and catalysis of IBiox-[(−)-menthyl]·HOTf
作者:Claudia Lohre、Corinna Nimphius、Marc Steinmetz、Sebastian Würtz、Roland Fröhlich、Constantin G. Daniliuc、Stefan Grimme、Frank Glorius
DOI:10.1016/j.tet.2012.06.039
日期:2012.9
Herein we provide an overview on the unique properties of the sterically demanding IBiox-[(-)-menthyl]center dot HOTf ligand (such as flexibility and sterics) and an application of this ligand in Pd-catalyzed asymmetric intra- and intermolecular alpha-arylation reactions. Furthermore we demonstrate the synthesis of novel NHC metal complexes and a new bifunctional NHC ligand whilst insight into the mechanistic mode of action of IBiox-[(-)-menthyl]center dot HOTf in catalysis is provided. (C) 2012 Elsevier Ltd. All rights reserved.
Wuertz, Sebastian; Lohre, Claudia; Froehlich, Roland, Journal of the American Chemical Society, 2009, vol. 131, p. 8344 - 8345
作者:Wuertz, Sebastian、Lohre, Claudia、Froehlich, Roland、Bergander, Klaus、Glorius, Frank