Manganese(III) complexes of bis(hydroxyphenyl)dipyrromethenes are potent orally active peroxynitrite scavengers

J Am Chem Soc. 2011 Mar 30;133(12):4200-3. doi: 10.1021/ja110427e. Epub 2011 Mar 3.

Abstract

We report a new series of biscyclohexano-fused Mn(III) complexes of bis(hydroxyphenyl)dipyrromethenes, 4a-c, as potent and orally active peroxynitrite scavengers. Complexes 4a-c are shown to reduce peroxynitrite through a two-electron mechanism, thereby forming the corresponding Mn(V)O species, which were characterized by UV, NMR, and LC-MS methods. Mn(III) complex 4b and its strained BODIPY analogue 9b were analyzed by X-ray crystallography. Finally, complex 4a is shown to be an orally active and potent analgesic in a model carrageenan-induced hyperalgesia known to be driven by the overproduction of peroxynitrite.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Crystallography, X-Ray
  • Free Radical Scavengers / chemical synthesis
  • Free Radical Scavengers / chemistry*
  • Manganese / chemistry*
  • Models, Molecular
  • Molecular Structure
  • Organometallic Compounds / chemical synthesis
  • Organometallic Compounds / chemistry*
  • Peroxynitrous Acid / chemistry*
  • Porphobilinogen / analogs & derivatives*
  • Porphobilinogen / chemistry
  • Stereoisomerism

Substances

  • Free Radical Scavengers
  • Organometallic Compounds
  • bis(hydroxyphenyl)dipyrromethene
  • Peroxynitrous Acid
  • Manganese
  • Porphobilinogen