Highly recoverable pyridinium-tagged Hoveyda–Grubbs pre-catalyst for olefin metathesis. Design of the boomerang ligand toward the optimal compromise between activity and reusability
Highly recoverable pyridinium-tagged Hoveyda–Grubbs pre-catalyst for olefin metathesis. Design of the boomerang ligand toward the optimal compromise between activity and reusability
METHOD AND SUBSTANCES FOR PREPARATION OF N-SUBSTITUTED PYRIDINIUM COMPOUNDS
申请人:Roche Diagnostics GmbH
公开号:EP2459537B1
公开(公告)日:2014-12-17
US8895747B2
申请人:——
公开号:US8895747B2
公开(公告)日:2014-11-25
[EN] METHOD AND SUBSTANCES FOR PREPARATION OF N-SUBSTITUTED PYRIDINIUM COMPOUNDS<br/>[FR] PROCÉDÉ ET SUBSTANCES POUR PRÉPARER DES COMPOSÉS DE PYRIDINIUM À SUBSTITUTION N
申请人:ROCHE DIAGNOSTICS GMBH
公开号:WO2011012269A2
公开(公告)日:2011-02-03
The present invention relates to a method for the synthesis of N-substituted pyridinium compounds by using an N-heteroaryl substituted pyridinium salt (Zincke salt) and reacting it with a nucleophilic amine. In this reaction the pyridinium ring of the Zincke salt reacts with the amine which induces ring opening followed by ring closing, whereby the nitrogen of the amine becomes part of the N-substituted pyridinium ring. Preferably the amine is a primary amine. Novel purine-substituted pyridyl compounds, which can e.g. used in the above reaction, are also disclosed.
Highly recoverable pyridinium-tagged Hoveyda–Grubbs pre-catalyst for olefin metathesis. Design of the boomerang ligand toward the optimal compromise between activity and reusability
Whereas the boomerang ligand of HoveydaâGrubbs pre-catalysts can be modified by attachment of a pyridinium tag to its benzylidene moiety, a precise adjustment of the length of the spacer allows the optimum balance to be reached between the activity of the catalyst and its recoverability, exceeding 98% after 6 catalytic runs in the best case.