Metallocenyl P-N ligands, preparation thereof, and use for asymmetric catalysis
申请人:Boaz Warren Neil
公开号:US20070244319A1
公开(公告)日:2007-10-18
Bidentate phosphine-nitrogen ligands are disclosed which include a phosphine linked with a nitrogen heterocycle through a chiral ferrocene backbone. The ligands can include an imidazole or a dihydroimidazole linked to the ferrocene through the 2-position. Ligands can be prepared with or without additional chirality in the heterocycle. The ligands are useful for asymmetric catalysis, such as for palladium-catalyzed asymmetric allylation and ruthenium-catalyzed asymmetric transfer hydrogenation, affording products with high enantioselectivities.
Stereoselective Synthesis of All Possible Phosferrox Ligand Diastereoisomers Displaying Three Elements of Chirality: Stereochemical Optimization for Asymmetric Catalysis
作者:Ross A. Arthurs、David L. Hughes、Christopher J. Richards
DOI:10.1021/acs.joc.9b03342
日期:2020.4.3
formed selectively by addition of o-TolPCl2 followed by PhMgBr ((Sc,Sp,Rphos and Sc,Rp,Sphos respectively). Preliminary application of these four ligand diastereoisomers, together with (Sc,Sp) and (Sc,Rp) Phosferrox (PPh2), to palladiumcatalysedallylic alkylation of trans-1,3-diphenylallyl acetate revealed a stepwise increase/decrease in ee, with the configuration of the matched/matched diastereoisomer
Mechanistic and asymmetric investigations of the Au-catalysed cross-coupling between aryldiazonium salts and arylboronic acids using (P,N) gold complexes
performed on gold complexes with (P,N) ligands. Employing 2-pyridylphenyl-diphenylphosphine allowed us to suggest three different mechanistic pathways, starting either with a transmetallation step, via two consecutive single electron transfers, or by implying a transmetallation between Au(I) and Au(III) species. Moreover, when using commercially available chiral (P,N) ligands, the asymmetric formation