Discovery of 3-aryl-5-acylpiperazinyl-pyrazoles as antagonists to the NK3 receptor
作者:Hamid R. Hoveyda、Marie-Odile Roy、Sebastien Blanc、Sophie Noël、Joseph M. Salvino、Mark A. Ator、Graeme Fraser
DOI:10.1016/j.bmcl.2011.02.033
日期:2011.4
A series of 3-aryl-5-acylpiperazinyl-pyrazoles (e.g., 3a-b) initially identified through a high-throughput screening campaign using the aequorin Ca2+ bioluminescence assay as novel, potent small molecule antagonists of the G protein-coupled human tachykinin NK3 receptor (hNK3-R) is described. Preliminary profiling revealed poor plasma and metabolic stability for these structures in rodents. Further optimization efforts resulted in analogs with improved potency, stability, and pharmacokinetic properties as well as good brain permeability, for example, compounds 26 and 42. Unexpected cytotoxicity was observed in such N-Me pyrazole structures as compounds 41-42. (C) 2011 Elsevier Ltd. All rights reserved.