Asymmetric fluorination of β-keto esters catalyzed by chiral rare earth perfluorinated organophosphates
作者:Shoko Suzuki、Hiroshi Furuno、Yasuo Yokoyama、Junji Inanaga
DOI:10.1016/j.tetasy.2005.12.029
日期:2006.2
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.