摘要:
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 [IC50 = 4.8 nM (pH) and 35 nM (CAP)] and orally available in rat (F% = 15.1). (C) 2003 Elsevier Ltd. All rights reserved.