A Widely Applicable Chiral Auxiliary, <i>cis</i>-2-Amino-3,3-dimethyl-1-indanol: Conversion to a Novel Phosphorus-Containing Oxazoline and Its Application as a Highly Efficient Ligand for the Palladium-Catalyzed Enantioselective Allylic Amination Reaction
作者:Atsushi Sudo、Kazuhiko Saigo
DOI:10.1021/jo970359e
日期:1997.8.1
A chiral amino alcohol, cis-2-amino-3,3-dimethyl-1-indanol (2), was converted into the corresponding enantiomerically pure phosphorus-containing oxazoline 4. Oxazoline 4 was found to be an efficient ligand for palladium-catalyzed enantioselective allylic amination reactions: In the amination reaction of (E)-1,3-diphenyl-2-propen-1-yl acetate (7a), 4 was found to be more efficient than the similar ligands 1a-c, derived from valinol, tert-leucinol, etc. Other 1,3-bis(p-substituted aryl)-2-propen-1-yl acetates were also converted to the corresponding amines in a similar manner and with excellent enantioselectivity. In the amination reaction of 1-alkyl-3,3-diphenyl-2-propen-1-yl acetates 11, the correponding amines 12 were obtained with excellent enantioselectivity when acetic acid was added to the reaction system.
Enantioselective Intermolecular Addition of Aliphatic Amines to Acyclic Dienes with a Pd–PHOX Catalyst
作者:Nathan J. Adamson、Ethan Hull、Steven J. Malcolmson
DOI:10.1021/jacs.7b03480
日期:2017.5.31
We report a method for the catalytic, enantioselective intermolecular addition of aliphatic amines to acyclic 1,3-dienes. In most cases, reactions proceed efficiently at or below room temperature in the presence of 5 mol % of a Pd catalyst bearing a PHOX ligand, generating allylic amines in up to 97:3 er. The presence of an electron-deficient phosphine within the ligand not only leads to a more active
An efficient phosphorus-containing oxazoline ligand derived from cis -2-amino-3,3-dimethyl-1-indanol: application to the palladium-catalyzed asymmetric Heck reaction
Enantiopure 2-[2-(diphenylphosphino)phenyl]oxazoline, derived from a non-natural chiral aminoalcohol, cis-2-amino-3,3-dimethyl-1-indanol, was found to be an efficientligand for the palladium-catalyzed asymmetric Heckreaction.