Direct Access to Pyrrolyltripyrrins and Calixsmaragdyrin from SNAr Reactions on α,α'-Dibromotripyrrins with Pyrroles or Indoles

Org Lett. 2023 Jun 23;25(24):4483-4488. doi: 10.1021/acs.orglett.3c01493. Epub 2023 Jun 9.

Abstract

Linear π-conjugated oligopyrroles are attractive precursors for the synthesis of expanded porphyrinoids, chemosensors, and supramolecular motifs. We demonstrate a new method for the synthesis of a set of linear pyrrolyltripyrrins and dipyrrolyltripyrrins through a regioselective SNAr reaction on α,α'-dibromotripyrrins using various pyrroles or indoles. A representative calixsmaragdyrin was prepared via the 2-fold SNAr reaction between α,α'-dibromotripyrrin and dipyrromethene through a convergent [3 + 2] strategy. These oligopyrroles showed intense deep red absorptions with an interesting pH response.

MeSH terms

  • Indoles* / chemistry
  • Molecular Structure
  • Pyrroles* / chemistry

Substances

  • Pyrroles
  • Indoles