Novel chiral rare earth metal complexes bearing perfluorinated binaphthyl phosphate ligand RE[(R)-F8BNP](3) (RE = rare earth; F8BNP = 5,5',6,6',7,7'.8,8'-octafluoro-1,1'-binaphthyl-2,2-diyl phosphate) have been synthesized and used as a catalyst for the asymmetric electrophilic fluorination reaction of beta-keto esters. The use of Sc[(R)-F8BNP](3) catalyst in combination with 1-fluoropyridinium triflate (NFPY-OTf) as a fluorinating agent was found to give the desired alpha-fluoro-beta-keto esters in high chemical yields and enantiomeric excesses (up to 88% ee) under mild conditions. (c) 2006 Elsevier Ltd. All rights reserved.
ASYMMETRIC LIGANDS HAVING USE AS CATALYSTS
申请人:1428388 Ontario Limited
公开号:EP1261573A2
公开(公告)日:2002-12-04
[EN] ASYMMETRIC LIGANDS HAVING USE AS CATALYSTS<br/>[FR] LIGANDS ASYMETRIQUES S'UTILISANT COMME DES CATALYSEURS
申请人:1428388 ONTARIO LTD
公开号:WO2001007386A2
公开(公告)日:2001-02-01
Disclosed are electronically perturbed asymmetric aromatic ligands. In one aspect, the ligands are polyfluorinated. The ligands may be nucleophilically substituted. The ligands have many useful applications including catalytic applications. In a preferred aspect, the ligands are polyfluorinated binaphthyl ring derivatives, which are 2,2' dihydroxy or dialkoxy substituted.