Oxidative ring closure and metal triggered ring opening: syntheses of macrocyclic and linear hexapyrroles

Org Lett. 2014 Dec 19;16(24):6354-7. doi: 10.1021/ol503132r. Epub 2014 Dec 8.

Abstract

A C6F5-substituted hexapyrrane (1) was synthesized in one step. Oxidative cyclization of 1 with DDQ afforded a phlorin-dipyrrin conjugate (2), and subsequent FeCl3-assisted oxidative cleavage of 2 afforded a terminally di-α-methoxy substituted hexapyrrin (3). On the other hand, oxidation of 1 with FeCl3 afforded 3, a hexapyrrinone Fe(3+) complex (4), and a hexaphyrin (1,1,1,1,1,0) (5). These results indicate that the oxidation of hexapyrranes may be developed as an effective approach for the syntheses of novel linear and macrocyclic hexapyrroles.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Catalysis
  • Coordination Complexes / chemical synthesis*
  • Coordination Complexes / chemistry*
  • Cyclization
  • Macrocyclic Compounds / chemical synthesis*
  • Macrocyclic Compounds / chemistry
  • Molecular Structure
  • Oxidation-Reduction
  • Pyrroles / chemical synthesis*
  • Pyrroles / chemistry

Substances

  • Coordination Complexes
  • Macrocyclic Compounds
  • Pyrroles