Discovery, synthesis and biological characterization of a series of -(1-(1,1-dioxidotetrahydrothiophen-3-yl)-3-methyl-1-pyrazol-5-yl)acetamide ethers as novel GIRK1/2 potassium channel activators.

The present study describes the discovery and characterization of a series of -(1-(1,1-dioxidotetrahydrothiophen-3-yl)-3-methyl-1-pyrazol-5-yl)acetamide ethers as G protein-gated inwardly-rectifying potassium (GIRK) channel activators. From our previous lead optimization efforts, we have identified a new ether-based scaffold and paired this with a novel sulfone-based head group to identify a potent and selective GIRK1/2 activator. In addition, we evaluated the compounds in tier 1 DMPK assays and have identified compounds that display nanomolar potency as GIRK1/2 activators with improved metabolic stability over the prototypical urea-based compounds.