From Bifunctional to Trifunctional (Tricomponent Nucleophile–Transition Metal–Lewis Acid) Catalysis: The Catalytic, Enantioselective α-Fluorination of Acid Chlorides
作者:Jeremy Erb、Daniel H. Paull、Travis Dudding、Lee Belding、Thomas Lectka
DOI:10.1021/ja2014345
日期:2011.5.18
fluorination of a ketene enolate intermediate. We discovered, for the first time, that a third catalyst, a Lewis acidic lithium salt, could be introduced into a dually activated system to amplify yields of aliphatic products, primarily through activation of the fluorinatingagent. Through our mechanistic studies (based on kinetic data, isotopic labeling, spectroscopic measurements, and theoretical calculations)
N-fluorosulfonimides and their application as fluorinating agents
申请人:Allied-Signal Inc.
公开号:US05478964A1
公开(公告)日:1995-12-26
The invention describes N-fluorosulfonimides which are useful as fluorinating agents. The N-fluorosulfonimides are stable, easily synthesized, and allow the introduction of fluorine into organic compounds under mild conditions.
Differding, E.; Frick, W.; Lang, R. W., Bulletin des Societes Chimiques Belges, 1990, vol. 99, # 9, p. 647 - 671
作者:Differding, E.、Frick, W.、Lang, R. W.、Martin, P.、Schmit, C.、et al.
DOI:——
日期:——
Selective mono- and difluorination of enolates
作者:Edmond Differding、Gabriela M. Rüegg、Robert W. Lang
DOI:10.1016/s0040-4039(00)74328-0
日期:1991.4
The selective transformation of enolates into mono- and difluorinated carbonyl compounds can be performed in a one-pot procedure using N-F-sultam 1. The yields and the selectivity of the fluorination strongly depend on the counterion of the enolate and the acidity of the protons alpha to the carbonyl group.
Unbalanced-Ion-Pair-Catalyzed Nucleophilic Fluorination Using Potassium Fluoride
作者:Wangbing Li、Zhichao Lu、Gerald B. Hammond、Bo Xu
DOI:10.1021/acs.orglett.1c03887
日期:2021.12.17
An unbalanced ion pair promoter (e.g., tetrabutylammonium sulfate), consisting of a bulky and charge-delocalized cation and a small and charge-localized anion, greatly accelerates nucleophilic fluorinations using easy handling KF. We also successfully converted an inexpensive and commercially available ion-exchange resin to the polymer-supported ion pair promoter (A26–SO42–), which could be reused