Journal
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
Volume 15, Issue 3, Pages 719-723Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmcl.2004.11.021
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A series of 4-(2-pyridyl)piperazine-1-benzimidazole analogues based on compound I was synthesized and evaluated for TRPV1 antagonist activity in capsaicin-induced (CAP) and pH5.5-induced (pH) FLIPR assays in a human TRPV1 -expressing HEK293 cell line. Potent TRPV1 antagonists were identified through SAR studies. From these studies, several antagonists were found, with IC50 values ranging from 32nM to similar to5000nM. Among these, 11 [IC50 = 90nM (CAP) and 104nM (pH)] was further evaluated and found to be orally available in rats (F% = 19.7). (C) 2004 Elsevier Ltd. All rights reserved.
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