Enantioselective fluorination of organic molecules. I. Synthetic studies of the agents for electrophilic, enantioselective fluorination of carbanions

Chem Pharm Bull (Tokyo). 1997 Jun;45(6):1085-8. doi: 10.1248/cpb.45.1085.

Abstract

In order to develop novel methods for electrophilic and enantioselective fluorination of active methine compounds, preliminary experiments were carried out. The N-tosyl derivative 5 obtained from D-phenylglycine was fluorinated with FClO3 or diluted F2 gas to give the N-fluoro-N-tosyl derivative 6. N-tosyl- or N-mesyl-(S)-alpha-phenethylamine 7 or 8 was subjected to FClO3 fluorination to produce the corresponding N-fluoro derivative, 10 or 11, respectively. Enantioselective fluorination of some methine compounds was attempted employing the above N-fluoro agents. Best result was obtained when 2-benzyl-1-tetralone/KHMDS was treated with 10 to produce the fluorinated tetralone 17 in 53% yield with enantiomeric excess (ee) of 48%.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anions / metabolism*
  • Carbon / metabolism
  • Chromatography, High Pressure Liquid
  • Fluorides / chemistry
  • Fluorine / metabolism*
  • Furans
  • Glycine / analogs & derivatives
  • Hydrogen Bonding
  • Indicators and Reagents / chemical synthesis*
  • Models, Chemical
  • Phenethylamines / chemistry
  • Phenethylamines / metabolism
  • Stereoisomerism
  • Sulfuric Acids / chemistry

Substances

  • Anions
  • Furans
  • Indicators and Reagents
  • Phenethylamines
  • Sulfuric Acids
  • Fluorine
  • phenethylamine
  • tetrahydrofuran
  • Carbon
  • fluorosulfonic acid
  • Fluorides
  • Glycine