Cp*Ir(III) and Cp*Rh(III)-catalyzed annulation of salicylaldehydes with fluorinated vinyl tosylates

Chem Commun (Camb). 2022 Aug 9;58(64):8966-8969. doi: 10.1039/d2cc02194c.

Abstract

A mild, selective and redox-neutral Cp*Ir(III)- and Cp*Rh(III)-catalyzed C-H activation/annulation of salicylaldehydes with fluorovinyl tosylates is reported. The use of monofluorovinyl tosylate favors the synthesis of C2- and C3-substitution-free chromones via C-H activation/β-F elimination/annulation, whereas difluorovinyl tosylate leads to the construction of C2-fluoroalkoxy chromones. Mild reaction conditions and good functional-group tolerance were observed. Further functionalization of the resulting chromones via halogenation, alkynylation, alkylation and hydrocyanation was successfully realized.

MeSH terms

  • Aldehydes
  • Alkylation
  • Catalysis
  • Chromones*
  • Molecular Structure

Substances

  • Aldehydes
  • Chromones
  • salicylaldehyde