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  • Title: Novel vanilloid receptor-1 antagonists: 1. Conformationally restricted analogues of trans-cinnamides.
    Author: Norman MH, Zhu J, Fotsch C, Bo Y, Chen N, Chakrabarti P, Doherty EM, Gavva NR, Nishimura N, Nixey T, Ognyanov VI, Rzasa RM, Stec M, Surapaneni S, Tamir R, Viswanadhan VN, Treanor JJ.
    Journal: J Med Chem; 2007 Jul 26; 50(15):3497-514. PubMed ID: 17585749.
    Abstract:
    The vanilloid receptor-1 (VR1 or TRPV1) is a member of the transient receptor potential (TRP) family of ion channels and plays a role as an integrator of multiple pain-producing stimuli. From a high-throughput screening assay, measuring calcium uptake in TRPV1-expressing cells, we identified an N-aryl trans-cinnamide (AMG9810, compound 9) that acts as a potent TRPV1 antagonist. We have demonstrated the antihyperalgesic properties of 9 in vivo and have also reported the discovery of novel, orally bioavailable cinnamides derived from this lead. Herein, we expand our investigations and describe the synthesis and biological evaluation of a series of conformationally constrained analogues of the s-cis conformer of compound 9. These investigations resulted in the identification of 4-amino- and 4-oxopyrimidine cores as suitable isosteric replacements for the trans-acrylamide moiety. The best examples from this series, pyrimidines 79 and 74, were orally bioavailable and exhibited potent antagonism of both rat (IC50 = 4.5 and 0.6 nM, respectively) and human TRPV1 (IC50 = 7.4 and 3.7 nM, respectively). In addition, compound 74 was shown to be efficacious at blocking a TRPV1-mediated physiological response in vivo in the capsaicin-induced hypothermia model in rats; however, it was ineffective at preventing thermal hyperalgesia induced by complete Freund's adjuvant in rats.
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