Document Report Card

ID: ALA3120085

Journal: J Med Chem

Title: Discovery and preclinical characterization of 1-methyl-3-(4-methylpyridin-3-yl)-6-(pyridin-2-ylmethoxy)-1H-pyrazolo-[3,4-b]pyrazine (PF470): a highly potent, selective, and efficacious metabotropic glutamate receptor 5 (mGluR5) negative allosteric modulator.

Authors: Zhang L, Balan G, Barreiro G, Boscoe BP, Chenard LK, Cianfrogna J, Claffey MM, Chen L, Coffman KJ, Drozda SE, Dunetz JR, Fonseca KR, Galatsis P, Grimwood S, Lazzaro JT, Mancuso JY, Miller EL, Reese MR, Rogers BN, Sakurada I, Skaddan M, Smith DL, Stepan AF, Trapa P, Tuttle JB, Verhoest PR, Walker DP, Wright AS, Zaleska MM, Zasadny K, Shaffer CL.

Abstract: A novel series of pyrazolopyrazines is herein disclosed as mGluR5 negative allosteric modulators (NAMs). Starting from a high-throughput screen (HTS) hit (1), a systematic structure-activity relationship (SAR) study was conducted with a specific focus on balancing pharmacological potency with physicochemical and pharmacokinetic (PK) properties. This effort led to the discovery of 1-methyl-3-(4-methylpyridin-3-yl)-6-(pyridin-2-ylmethoxy)-1H-pyrazolo[3,4-b]pyrazine (PF470, 14) as a highly potent, selective, and orally bioavailable mGluR5 NAM. Compound 14 demonstrated robust efficacy in a 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-rendered Parkinsonian nonhuman primate model of l-DOPA-induced dyskinesia (PD-LID). However, the progression of 14 to the clinic was terminated because of a potentially mechanism-mediated finding consistent with a delayed-type immune-mediated type IV hypersensitivity in a 90-day NHP regulatory toxicology study.

CiteXplore: 24392688

DOI: 10.1021/jm401622k