4-(2-pyridyl)piperazine-1-carboxamides: potent vanilloid receptor 1 antagonists.
2003
Abstract A series of 4-(2-pyridyl)piperazine-1-carboxamide analogues based on the lead compound 1 was synthesized and evaluated for VR1 antagonist activity in capsaicin-induced (CAP) and pH (5.5)-induced (pH) FLIPR assays in a rat VR1-expressing HEK293 cell line. Potent VR1 antagonists were identified through SAR studies. From these studies, 18 was found to be very potent in the in vitro assay [IC 50 =4.8 nM (pH) and 35 nM (CAP)] and orally available in rat (F%=15.1).
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