[EN] OPTICALLY PURE ENANTIOMERS OF RUTHENIUM COMPLEXES AND USES THEREOF [FR] ÉNANTIOMÈRES OPTIQUEMENT PURS DE COMPLEXES DE RUTHÉNIUM ET LEURS UTILISATIONS
Single (substitution) is better: New chiralruthenium metathesis (pre)catalysts with a monosubstituted carbon atom in the N‐heterocyclic carbene ligand are highly stable in solution, initiate easily, show very high enantioselectivity and excellent E selectivity in asymmetric ring‐opening cross‐metathesis (see scheme).
An expedient access to the first optically pure ruthenium complexes containing C1-symmetric cyclic (alkyl)(amino)carbene ligands is reported. They demonstrate excellent catalytic performances in asymmetric olefinmetathesis with high enantioselectivities (up to 92% ee). Preliminary mechanistic insights provided by density functional theory models highlight the origin of the enantioselectivity.
A Recyclable Chiral Ru Catalyst for Enantioselective Olefin Metathesis. Efficient Catalytic Asymmetric Ring-Opening/Cross Metathesis in Air
作者:Joshua J. Van Veldhuizen、Steven B. Garber、Jason S. Kingsbury、Amir H. Hoveyda
DOI:10.1021/ja020259c
日期:2002.5.1
a new chiral bidentate imidazolinylidene ligand and a derived chiral Ru-based carbene are disclosed. The Ru complex is stereogenic at the metal center; it can be prepared in >98% diastereoselectivity and purified by silica gel chromatography with undistilled solvents. The air-stable Ru complex efficiently catalyzes ring-closing and ring-opening metathesis and is recyclable. The chiralcomplex is highly
[EN] NOVEL RUTHENIUM COMPLEXES, A METHOD OF PRODUCING THEM, AND THEIR USE IN OLEFIN METATHESIS<br/>[FR] NOUVEAUX COMPLEXES DE RUTHÉNIUM, LEUR PROCÉDÉ DE PRODUCTION ET UTILISATION DANS LA MÉTATHÈSE D'OLÉFINES
申请人:INST CHEMII ORGANICZNEJ PAN
公开号:WO2014102622A1
公开(公告)日:2014-07-03
The subject of the present invention are novel, chiral non-racemic ruthenium complexes defined by the general Formula 1, The present invention also relates to methods of manufacturing of a novel, chiral non-racemic ruthenium complexes defined by the general Formula 1 as well as their use in asymmetric olefin metathesis reactions.
A bridge connects and efficiently transfers the chirality from the backbone of a N‐heterocyclic carbene (NHC) to the metal center. The result is excellent enantioselectivities in the ruthenium‐catalyzed, asymmetric ring‐opening cross‐metathesis of norbornenes with allyltrimethylsilane (see scheme).