A C(aryl)N(amine) bond atropisomeric aminophosphine: preparation and use as a ligand in a catalytic asymmetric allylic alkylation
摘要:
The existence of 3 as a pair of stable atropisomers has been demonstrated analytically through chiral phase LC-CD investigations. Resolution of 3d was achieved by preparative chiral HPLC. Finally, the ability of the first C(aryl)-N(amine) axially chiral phosphine ligand 3d is demonstrated in a catalytic asymmetric reaction. (C) 2003 Elsevier Ltd. All rights reserved.
A C(aryl)N(amine) bond atropisomeric aminophosphine: preparation and use as a ligand in a catalytic asymmetric allylic alkylation
摘要:
The existence of 3 as a pair of stable atropisomers has been demonstrated analytically through chiral phase LC-CD investigations. Resolution of 3d was achieved by preparative chiral HPLC. Finally, the ability of the first C(aryl)-N(amine) axially chiral phosphine ligand 3d is demonstrated in a catalytic asymmetric reaction. (C) 2003 Elsevier Ltd. All rights reserved.
N-Aryl indole-derived C–N bond axially chiral phosphine ligands 2a–c were obtained by DDQ oxidation of N-aryl indoline-derived phosphine oxide followed by silane reduction. Resolution of C–N bond atropisomers was achieved by chiral HPLC. The investigation of the rotation barrier for the C–N bond axial stability of phosphines and the determination of the absolute configuration of 2c are described. Finally