- Gogliotti RD, Engers DW, Garcia-Barrantes PM, Panarese JD, Gentry PR, Blobaum AL, Morrison RD, Daniels JS, Thompson AD, Jones CK, Conn PJ, Niswender CM, Lindsley CW, Hopkins CR. Discovery of 3-aminopicolinamides as metabotropic glutamate receptor subtype 4 (mGlu4) positive allosteric modulator warheads engendering CNS exposure and in vivo efficacy. Bioorganic & medicinal chemistry letters. 2016 Apr 19. PMID: 27131990 [PubMed].
This letter describes the further chemical optimization of the picolinamide-derived family of mGlu4 PAMs wherein we identified a 3-amino substituent to the picolinamide warhead that engendered potency, CNS penetration and in vivo efficacy. From this optimization campaign, VU0477886 emerged as a potent (EC50=95nM, 89% Glu Max) mGlu4 PAM with an attractive DMPK profile (brain:plasma Kp=1.3), rat CLp=4.0mL/min/kg, t1/2=3.7h) and robust efficacy in our standard preclinical Parkinson's disease model, haloperidol-induced catalepsy (HIC).