Optimization of Selective and CNS Penetrant Alkyne-Based TREK Inhibitors: The Discovery and Characterization of ONO-9517601 (VU6022856) and ONO-7927846 (VU6024391)

Herein we describe the chemical optimization of a selective and CNS penetrant series of TREK inhibitors (the K(2)P family of potassium ion channels), culminating in the discovery of ONO-9517601 (VU6022856) and ONO-7927846 (VU6024391). Optimization of ONO-TR-772 focused on replacements for the N-Boc aniline moiety and identified N-acyl piperidine pyrazoles as attractive surrogates, affording excellent potency, PK profiles, CNS penetration and ion channel selectivity. ONO-9517601 and ONO-7927846 displayed robust efficacy in an MK-801 challenge rat NOR paradigm, with MEDs of 1 mg/kg and 0.3 mg/kg, respectively. These ligands represent valuable preclinical research tools for exploring selective TREK inhibition in vitro and in vivo.