Tetramethylfluoroformamidinium Hexafluorophosphate (TFFH) as a Mild Deoxofluorination Reagent
作者:Pascal Dubé、Gabriel Bellavance、Bao Nguyen
DOI:10.1055/s-0031-1290336
日期:2012.3
air-stable peptide coupling reagent TFFH (tetramethylfluoroformamidinium hexafluorophosphate) was found to activate a variety of alcohols towards deoxofluorination. These conditions are compatible with carbonyl functional groups thus offering interesting possibilities for the application to sensitive molecules. deoxofluorination - fluoroformamidinium -fluoride- TFFH -fluorination
Synthesis of 3-substituted 3-fluoro-2-oxindoles by deacylative alkylation
作者:Cynthia Molina、Aitor Ortega-Martínez、José M. Sansano、Carmen Nájera
DOI:10.1039/c8ob01811a
日期:——
carried out with allylic alcohols using LiOtBu as the base and 6 mol% of Pd(OAc)2 and dppp, giving the resulting 3-allylated 3-fluoro-2-oxindoles in good yields. This methodology allows a simple synthesis of 3-alkylated-3-fluoro-2-oxindoles, which are difficult to obtain by other routes.
An efficient transition-metal-free fluoroarylation reaction of N-aryl diazoacetamides with NFSI (N-fluorobenzenesulfonimide) is described. This reaction directly provides 3-fluorooxindole derivatives in yields of 67-93% with high selectivity via a carbene-free process under mild reaction conditions.
Ionic liquids as solvents of choice for electrophilic fluorination: fluorination of indoles by F-TEDA-BF 4
Selectfluor™ was shown to be soluble in ionicliquid, thus allowing the ‘green’ electrophilicfluorination of indole compounds in high chemoselectivity and yields.