Enantiomerically pure pyridine and 2,2′-bipyridine thioethers: new N–S chiral ligands for asymmetric catalysis. Palladium-catalyzed allylic alkylation
摘要:
Diastereomeric pure pyridine and 2,2'-bipyridine thioethers, derived from (+)-camphor, were prepared and assessed in the enantioselective palladium-catalyzed allylic substitution of 1,3-diphenylprop-2-enyl acetate with dimethyl malonate. Enantioselectivities of up to 76% were obtained. (C) 1999 Elsevier Science Ltd. All rights reserved.
Chiral ligands and their transition metal complexes
申请人:Scholz Ulrich
公开号:US20070066825A1
公开(公告)日:2007-03-22
The present invention relates to chiral phosphorus compounds and their transition metal complexes, and also to the use of these transition metal complexes, especially in asymmetric syntheses.
New Applications of Camphor-Derived P,N-Ligands for Asymmetric Pd- and Ir-Catalyzed Reactions
作者:Martine Bonin、Laurent Micouin、Paul Knochel、Tanasri Bunlaksananusorn、Alejandro Pérez Luna
DOI:10.1055/s-2003-42067
日期:——
Ir-catalyzedasymmetric hydroboration of bicyclic hydrazine 4 in the presence of chiral ligand la, leads to bicyclic alcohol 5 after oxidative workup in good yield (76%) and moderate enantioselectivity (71 % ee).
<i>t</i>-BuOK-Mediated Hydrophosphination of Functionalized Alkenes: A Novel Synthesis of Chiral P,N- and P,P-Ligands
作者:Tanasri Bunlaksananusorn、Paul Knochel
DOI:10.1021/jo030383u
日期:2004.7.1
A novel synthesis of effective chiral P,N- and P,P-ligands has been developed by using a t-BuOK-mediated hydrophosphination of chiral alkenylpyridines and alkenylphosphine oxides. Ir complexes of chiral P,N-ligrands 1 and 3 gave high enantioselectivities for the hydrogenation of (Z)-alpha(acetamido)cinnamate 25 and (E)-1,2-diphenylpropene leading to the hydrogenated products with up to 97% ee.
[DE] CHIRALE LIGANDEN UND DEREN ÜBERGANGSMETALLKOMPLEXE<br/>[EN] CHIRAL LIGANDS AND THEIR TRANSITION METAL COMPLEXES<br/>[FR] LIGANDS CHIRAUX ET LEURS COMPLEXES DE METAUX DE TRANSITION
申请人:BAYER CHEMICALS AG
公开号:WO2004104014A3
公开(公告)日:2005-03-17
New P,N Ligands for Asymmetric Ir-Catalyzed Reactions