Stereoconvergent arylations and alkenylations of unactivated alkyl electrophiles: catalytic enantioselective synthesis of secondary sulfonamides and sulfones

J Am Chem Soc. 2014 Aug 27;136(34):12161-5. doi: 10.1021/ja506885s. Epub 2014 Aug 15.

Abstract

The development of efficient methods for the generation of enantioenriched sulfonamides and sulfones is an important objective for fields such as organic synthesis and medicinal chemistry; however, there have been relatively few reports of direct catalytic asymmetric approaches to controlling the stereochemistry of the sulfur-bearing carbon of such targets. In this report, we describe nickel-catalyzed stereoconvergent Negishi arylations and alkenylations of racemic α-bromosulfonamides and -sulfones that furnish the desired cross-coupling product in very good ee and yield for an array of reaction partners. Mechanistic studies are consistent with the generation of a radical intermediate that has a sufficient lifetime to diffuse out of the solvent cage and to cyclize onto a pendant olefin.

Publication types

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

MeSH terms

  • Alkanes / chemistry*
  • Alkenes / chemistry*
  • Catalysis
  • Cyclization
  • Electron Transport
  • Hydrocarbons, Aromatic / chemical synthesis*
  • Hydrocarbons, Aromatic / chemistry
  • Nickel
  • Organometallic Compounds / chemistry
  • Stereoisomerism
  • Sulfonamides / chemical synthesis*
  • Sulfonamides / chemistry
  • Sulfones / chemical synthesis
  • Sulfones / chemistry
  • Zinc / chemistry
  • Zirconium / chemistry

Substances

  • Alkanes
  • Alkenes
  • Hydrocarbons, Aromatic
  • Organometallic Compounds
  • Sulfonamides
  • Sulfones
  • Nickel
  • Zirconium
  • Zinc