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.
Regioselective Substitution of Fluorine in F<sub>8</sub>BINOL as a Versatile Route to New Ligands with Axial Chirality
作者:Yu Chen、Shahla Yekta、L. James P. Martyn、Juan Zheng、Andrei K. Yudin
DOI:10.1021/ol006428k
日期:2000.11.1
aromatic fluorine in F(8)BINOL offers the possibility of selectively introducing a variety of substituents at the 6, 6', 7, and 7' positions. The configurational integrity of the homochiral precursors is maintained under the conditions described, allowing one to carry out these modification protocols on a microscale without the need for subsequent resolution steps. The resulting chiral ligands have been investigated