Design, synthesis, and evaluation of imidazo[4,5-c]pyridin-4-one derivatives with dual activity at angiotensin II type 1 receptor and peroxisome proliferator-activated receptor-γ

Bioorg Med Chem Lett. 2013 Feb 1;23(3):767-72. doi: 10.1016/j.bmcl.2012.11.088. Epub 2012 Dec 1.

Abstract

Identification of a series of imidazo[4,5-c]pyridin-4-one derivatives that act as dual angiotensin II type 1 (AT1) receptor antagonists and peroxisome proliferator-activated receptor-γ (PPARγ) partial agonists is described. Starting from a known AT1 antagonist template, conformational restriction was introduced by incorporation of an indane ring that when combined with appropriate substitution at the imidazo[4,5-c]pyridin-4-one provided novel series 5 possessing the desired dual activity. The mode of interaction of this series with PPARγ was corroborated through the X-ray crystal structure of 12b bound to the human PPARγ ligand binding domain. Modulation of activity at both receptors through substitution at the pyridone nitrogen led to the identification of potent dual AT1 antagonists/PPARγ partial agonists. Among them, 21b was identified possessing potent dual pharmacology (AT1 IC(50) = 7 nM; PPARγ EC(50) = 295 nM, 27% max) and good ADME properties.

MeSH terms

  • Angiotensin II Type 1 Receptor Blockers / chemical synthesis*
  • Angiotensin II Type 1 Receptor Blockers / chemistry
  • Angiotensin II Type 1 Receptor Blockers / pharmacology*
  • Benzimidazoles / chemistry
  • Benzimidazoles / pharmacology
  • Benzoates / chemistry
  • Benzoates / pharmacology
  • Crystallography, X-Ray
  • Humans
  • Imidazoles / chemical synthesis
  • Imidazoles / chemistry
  • Imidazoles / pharmacology
  • Inhibitory Concentration 50
  • Models, Molecular
  • Molecular Conformation
  • PPAR gamma / agonists
  • PPAR gamma / metabolism*
  • Protein Binding / drug effects
  • Pyridines / chemical synthesis*
  • Pyridines / chemistry
  • Pyridines / pharmacology*
  • Pyridones / chemical synthesis
  • Pyridones / chemistry
  • Pyridones / pharmacology
  • Receptor, Angiotensin, Type 1 / metabolism*
  • Telmisartan

Substances

  • Angiotensin II Type 1 Receptor Blockers
  • Benzimidazoles
  • Benzoates
  • Imidazoles
  • PPAR gamma
  • Pyridines
  • Pyridones
  • Receptor, Angiotensin, Type 1
  • Telmisartan