Nickel-catalyzed cross-coupling of chromene acetals and boronic acids

Org Lett. 2012 Mar 16;14(6):1616-9. doi: 10.1021/ol300364s. Epub 2012 Mar 2.

Abstract

A modular and highly efficient protocol for the synthesis of 2-aryl- and heteroaryl-2H-chromenes is described. Under base-free conditions, readily accessible 2-ethoxy-2H-chromenes undergo C(sp(3))-O activation and C(sp(3))-C bond formation in the presence of an inexpensive nickel catalyst and boronic acids. This new strategy enables broad access to 2-substituted-2H-chromenes and has been applied to the late-stage incorporation of complex molecules, including the pharmaceuticals loratidine and indomethacin methyl ester.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetals / chemistry*
  • Benzopyrans / chemical synthesis*
  • Benzopyrans / chemistry*
  • Boronic Acids / chemistry*
  • Catalysis
  • Molecular Structure
  • Nickel / chemistry*

Substances

  • Acetals
  • Benzopyrans
  • Boronic Acids
  • Nickel