Palladium-Catalyzed Enantioselective α-Arylation of α-Fluoroketones

J Am Chem Soc. 2016 Dec 14;138(49):15980-15986. doi: 10.1021/jacs.6b09580. Epub 2016 Dec 1.

Abstract

The transition-metal-catalyzed α-arylation of carbonyl compounds is a widely practiced method for C-C bond formation. Several enantioselective versions of this process have been reported, but intermolecular, enantioselective coupling reactions of aryl electrophiles with α-fluoro carbonyl compounds have yet to be disclosed. We report enantioselective coupling of aryl and heteroaryl bromides and triflates with α-fluoroindanones catalyzed by palladium complexes of a BINOL-derived monophosphine and Segphos, respectively. The enolates were generated directly from α-fluoroindanones in the presence of potassium phosphate base during the reactions. We also report that reactions of α-fluorotetralones occur in high yields and enantioselectivities when conducted with enolates generated by elimination of trifluoroacetate from trifluoromethyl β-diketone hydrates. These reactions were catalyzed by palladium complexes of the commercially available bisphosphine Difluorphos. Thus, the formation of enantioenriched α-aryl-α-fluoroketones can be readily achieved by C-C bond formation when the appropriate palladium catalyst and α-fluoro enolate precursor were used.

Publication types

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

MeSH terms

  • Catalysis
  • Hydrocarbons, Fluorinated / chemical synthesis*
  • Hydrocarbons, Fluorinated / chemistry
  • Ketones / chemical synthesis*
  • Ketones / chemistry
  • Molecular Structure
  • Palladium / chemistry*
  • Stereoisomerism

Substances

  • Hydrocarbons, Fluorinated
  • Ketones
  • Palladium