Asymmetric Synthesis of Multisubstituted Dihydrobenzofurans by Intramolecular Conjugate Addition of Short-Lived C-O Axially Chiral Enolates

Chem Pharm Bull (Tokyo). 2016 Jul 1;64(7):899-906. doi: 10.1248/cpb.c16-00272. Epub 2016 May 3.

Abstract

Enantioselective intramolecular conjugate addition reactions of short-lived C-O axially chiral enolates have been developed. The reactions proceeded with inversion of the configuration and provided dihydrobenzofurans with contiguous tetra- and trisubstituted carbon centers in up to 96% enantiomeric excess (ee).

MeSH terms

  • Benzofurans / chemical synthesis*
  • Benzofurans / chemistry
  • Ketones / chemistry*
  • Molecular Conformation

Substances

  • Benzofurans
  • Ketones