Structure-activity studies of a novel series of 5,6-fused heteroaromatic ureas as TRPV1 antagonists

Bioorg Med Chem. 2006 Jul 15;14(14):4740-9. doi: 10.1016/j.bmc.2006.03.027. Epub 2006 Apr 18.

Abstract

Novel 5,6-fused heteroaromatic ureas were synthesized and evaluated for their activity as TRPV1 antagonists. It was found that 4-aminoindoles and indazoles are the preferential cores for the attachment of ureas. Bulky electron-withdrawing groups in the para-position of the aromatic ring of the urea substituents imparted the best in vitro potency at TRPV1. The most potent derivatives were assessed in in vivo inflammatory and neuropathic pain models. Compound 46, containing the indazole core and a 3,4-dichlorophenyl group appended to it via a urea linker, demonstrated in vivo analgesic activity upon oral administration. This derivative also showed selectivity versus other receptors in the CEREP screen and exhibited acceptable cardiovascular safety at levels exceeding the therapeutic dose.

MeSH terms

  • Animals
  • In Vitro Techniques
  • Kinetics
  • Male
  • Mice
  • Motor Activity / drug effects
  • Pain Measurement
  • Rats
  • Rats, Sprague-Dawley
  • Structure-Activity Relationship
  • TRPV Cation Channels / antagonists & inhibitors*
  • TRPV Cation Channels / metabolism
  • Urea / analogs & derivatives*
  • Urea / chemical synthesis
  • Urea / chemistry
  • Urea / pharmacology

Substances

  • TRPV Cation Channels
  • TRPV1 receptor
  • Urea