A series of 2,3,6-pyrazine Rho Kinase inhibitors were optimized for in vivo activity for topical ocular dosing. Modifications of the 2-(piperazin-1-yl) pyrazine derivatives produced compounds with improved solubility and physicochemical properties. Modifications of the 6-pyrazine substituent led to improvements in in vitro potency. Compound 9 had the best in vitro and in vivo potency of EC50 = 260 nM with a 30% reduction of IOP in a non-human primate model at a dose of 0.33%.
- IOP reduction
- Rho Kinase