2-[(3a R,4 R,5 S,7a S)-5-{(1 S)-1-[3,5-bis(trifluoromethyl)phenyl]-2- hydroxyethoxy}-4-(2-methylphenyl)octahydro-2 H -isoindol-2-yl]-1,3-oxazol-4(5 H)-one: A potent human NK1 receptor antagonist with multiple clearance pathways

摘要

Hydroisoindoline 2 has been previously identified as a potent, brain-penetrant NK_1 receptor antagonist with a long duration of action and improved profile of CYP3A4 inhibition and induction compared to aprepitant. However, compound 2 is predicted, based on data in preclinical species, to have a human half-life longer than 40 h and likely to have drug-drug-interactions (DDI), as 2 is a victim of CYP3A4 inhibition caused by its exclusive clearance pathway via CYP3A4 oxidation in humans. We now report 2-[(3aR,4R,5S,7aS)-5-{(1S)-1-[3,5-bis(trifluoromethyl)phenyl]-2-hydroxyethoxy} -4-(2-methylphenyl)octahydro-2H-isoindol-2-yl]-1,3-oxazol-4(5H)-one (3) as a next generation NK_1 antagonist that possesses an additional clearance pathway through glucuronidation in addition to that via CYP3A4 oxidation. Compound 3 has a much lower propensity for drug-drug interactions and a reduced estimated human half-life consistent with once daily dosing. In preclinical species, compound 3 has demonstrated potency, brain penetration, and a safety profile similar to 2, as well as excellent pharmacokinetics.