Selective C-F Functionalization of Unactivated Trifluoromethylarenes

J Am Chem Soc. 2019 Aug 21;141(33):13203-13211. doi: 10.1021/jacs.9b06004. Epub 2019 Aug 9.

Abstract

Fluorinated organic molecules are pervasive within the pharmaceutical and agrochemical industries due to the range of structural and physicochemical properties that fluorine imparts. Currently, the most abundant methods for the synthesis of the aryl-CF2 functionality have relied on the deoxyfluorination of ketones and aldehydes using expensive and poorly atom economical reagents. Here, we report a general method for the synthesis of aryl-CF2R and aryl-CF2H compounds through activation of the corresponding trifluoromethyl arene precursors. This strategy is enabled by an endergonic electron transfer event that provides access to arene radical anions that lie outside of the catalyst reduction potential. Fragmentation of these reactive intermediates delivers difluorobenzylic radicals that can be intercepted by abundant alkene feedstocks or a hydrogen atom to provide a diverse array of difluoalkylaromatics.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Alkenes / chemical synthesis
  • Alkenes / chemistry
  • Alkylation
  • Carbon / chemistry
  • Fluorides / chemical synthesis
  • Fluorides / chemistry
  • Fluorine / chemistry*
  • Halogenation
  • Hydrocarbons, Aromatic / chemical synthesis
  • Hydrocarbons, Aromatic / chemistry*
  • Methylation

Substances

  • Alkenes
  • Hydrocarbons, Aromatic
  • Fluorine
  • Carbon
  • Fluorides