Enantioselective cross-coupling of meso-epoxides with aryl halides

J Am Chem Soc. 2015 Mar 11;137(9):3237-40. doi: 10.1021/jacs.5b01909. Epub 2015 Mar 2.

Abstract

The first enantioselective cross-electrophile coupling of aryl bromides with meso-epoxides to form trans-β-arylcycloalkanols is presented. The reaction is catalyzed by a combination of (bpy)NiCl2 and a chiral titanocene under reducing conditions. Yields range from 57 to 99% with 78-95% enantiomeric excess. The 30 examples include a variety of functional groups (ether, ester, ketone, nitrile, ketal, trifluoromethyl, sulfonamide, sulfonate ester), both aryl and vinyl halides, and five- to seven-membered rings. The intermediacy of a carbon radical is strongly suggested by the conversion of cyclooctene monoxide to an aryl [3.3.0]bicyclooctanol.

Publication types

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

MeSH terms

  • Bromides / chemistry
  • Catalysis
  • Epoxy Compounds / chemistry*
  • Esters / chemistry
  • Ethers / chemistry
  • Ketones / chemistry
  • Nickel / chemistry
  • Organometallic Compounds / chemistry
  • Stereoisomerism

Substances

  • Bromides
  • Epoxy Compounds
  • Esters
  • Ethers
  • Ketones
  • Organometallic Compounds
  • titanocene
  • nickel chloride
  • Nickel