Discovery of GSK345931A: An EP1 receptor antagonist with efficacy in preclinical models of inflammatory pain

Herein we describe the medicinal chemistry programme to identify a potential back-up compound to the EP1 receptor antagonist GW848687X. This work started with the lipophilic 1,2-biaryl benzene derivative 4 which displayed molecular weight of 414.9 g/mol and poor in vivo metabolic stability in the rat and resulted in the identification of compound 7i (GSK345931A) which demonstrated good metabolic stability in the rat and lower molecular weight (381.9 g/mol). In addition, 7i (GSK345931A) showed measurable CNS penetration in the mouse and rat and potent analgesic efficacy in acute and sub-chronic models of inflammatory pain.

Graphical abstractThis paper details the discovery and characterization of GSK345931 (7i) from the lead compound 4.Figure optionsDownload full-size imageDownload as PowerPoint slide