5-Substituted-2-furaldehydes: a synthetic protocol utilizing an organozinc route

J Org Chem. 2013 Mar 1;78(5):1984-93. doi: 10.1021/jo301836x. Epub 2012 Nov 13.

Abstract

Facile synthetic routes for the preparation of a wide range of 5-substituted 2-furaldehydes have been revealed. They were accomplished through either Pd-catalyzed cross-coupling reaction of various aryl- and heteroarylzinc halides with 5-bromo-2-furaldehyde or utilization of a new organozinc reagent, 5-(1,3-dioxolan-2-yl)-2-furanylzinc bromide, which was easily prepared by the direct insertion of highly active zinc to 2-(5-bromofuran-2-yl-1,3-dioxolane. Of special note is the uniqueness of using a new organozinc reagent, representing a first example of the direct synthesis of the corresponding organozinc halide. The subsequent coupling reactions in various types of reaction conditions led to the formation of somewhat different furan derivatives. It is also of significance that all of the cross-coupling reactions were carried out under mild conditions.

MeSH terms

  • Catalysis
  • Cross-Linking Reagents
  • Furaldehyde / chemical synthesis*
  • Furaldehyde / chemistry
  • Molecular Structure
  • Organometallic Compounds / chemical synthesis*
  • Organometallic Compounds / chemistry
  • Zinc / chemistry*

Substances

  • Cross-Linking Reagents
  • Organometallic Compounds
  • Furaldehyde
  • Zinc