Novel diphosphines, their complexes with transisition metals and their use in asymmetric synthesis
申请人:——
公开号:US20040260101A1
公开(公告)日:2004-12-23
The invention relates to novel diphosphines, in optically pure or racemic form, of formula (I):
1
in which:
R
1
and R
2
are a (C
5
-C
7
)cycloalkyl group, an optionally substituted phenyl group or a 5-membered heteroaryl group; and
A is (CH
2
—CH
2
) or CF
2
.
The invention further relates to the use of a compound of formula (I) as a ligand for the preparation of a metal complex useful as a chiral catalyst in asymmetric catalysis, and to the chiral metal catalysts comprising at least one ligand of formula (I).
Synthesis of Axially Chiral 2,2′-Bisphosphobiarenes via a Nickel-Catalyzed Asymmetric Ullmann Coupling: General Access to Privileged Chiral Ligands without Optical Resolution
作者:Ziqing Zuo、Raphael S. Kim、Donald A. Watson
DOI:10.1021/jacs.0c12843
日期:2021.1.27
We report an asymmetric homocoupling of ortho-(iodo)arylphosphine oxides and ortho-(iodo)arylphosphonates resulting in highly enantioenriched axially chiral bisphosphine oxides and bisphosphonates. These products are readily converted to enantioenriched biaryl bisphosphines without need for chiralauxiliaries or optical resolution. This provides a practical route for the development of previously uninvestigated
The new chiral diphosphineligand [(5,6), (5′,6′)-bis(1,2-ethylenedioxy)biphenyl-2,2′-diyl]bis(diphenylphosphine) (BisbenzodioxanPhos) has been successfully prepared and used in ruthenium-catalyzed asymmetric hydrogenation of 2-(6′-methoxy-2′-naphthyl)propenoic acid and β-keto esters with high enantioselectivity (92.2% and up to 99.5% ee, respectively).
SYNPHOS: a New Atropisomeric Diphosphine Ligand. From Laboratory-scale Synthesis to Scale-up Development
作者:Sébastien Duprat de Paule、Séverine Jeulin、Virginie Ratovelomanana-Vidal、Jean-Pierre Genêt、Nicolas Champion、Gilles Deschaux、Philippe Dellis
DOI:10.1021/op034016w
日期:2003.5.1
A new optically active diphosphine ligand, [(5,6),(5',6')-bis(ethlenedioxy)biphenyl-2,2'-diyl]bis(diphenylphosphine) (SYNPHOS) has been synthesized. Laboratory-scale synthesis and scale-up development of this ligand are described herein. This new atropisomeric diphosphine was also used in ruthenium-catalyzed asymmetric hydrogenation.
DIPHOSPHINES ET LEUR UTILISATION EN SYNTHESE ASYMETRIQUE