Silver-catalyzed domino hydroarylation/cycloisomerization reactions of ortho-alkynylbenzaldehydes: an entry to functionalized isochromene derivatives

Org Lett. 2014 Sep 5;16(17):4570-3. doi: 10.1021/ol5021256. Epub 2014 Aug 18.

Abstract

A Ag-catalyzed versatile and efficient access to 1H,1-arylisochromenes is reported. Starting from ortho-alkynylbenzaldehydes bearing various substitution patterns on the benzaldehyde and alkynyl units, the use of silver triflate (10 mol %) allowed a domino hydroarylation/cycloisomerization reaction process, leading to aryl-functionalized 1H-isochromene (>10 compounds, 80-98% yields). Notably, the reaction conditions were also compatible with benzaldehydes bearing an aliphatic-substituted alkynyl moiety with modest to good yields (34-88%, 10 compounds).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkynes
  • Benzaldehydes / chemistry
  • Benzopyrans / chemical synthesis*
  • Benzopyrans / chemistry
  • Catalysis
  • Cyclization
  • Mesylates / chemistry
  • Molecular Structure

Substances

  • Alkynes
  • Benzaldehydes
  • Benzopyrans
  • Mesylates
  • trifluoromethanesulfonic acid
  • benzaldehyde