The enantioselective addition of 1-fluoro-1-nitro(phenylsulfonyl)methane to isatin-derived ketimines

Org Biomol Chem. 2017 Nov 7;15(43):9071-9076. doi: 10.1039/c7ob02408h.

Abstract

An asymmetric organocatalytic addition of fluorinated phenylsulfonylnitromethane to isatin-derived ketimines was developed. The reaction was efficiently catalyzed by a chiral tertiary amine, cinchonine. This methodology provides a new type of optically active compound with two adjacent quaternary carbon stereocenters in good yield (up to 96%), with moderate diastereoselectivity (up to 5.7 : 1 dr) and excellent enantioselectivity (up to 98/96% ee).

MeSH terms

  • Benzenesulfonates / chemistry*
  • Imines / chemistry*
  • Isatin / chemistry*
  • Methane / chemistry*
  • Nitriles / chemistry*
  • Stereoisomerism

Substances

  • 1-fluoro-1-nitro(phenylsulfonyl)methane
  • Benzenesulfonates
  • Imines
  • Nitriles
  • ketimine
  • Isatin
  • Methane