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Discovery of a Highly Selective, Brain-Penetrant Aminopyrazole LRRK2 Inhibitor #MMPMID24900567
Chan BK; Estrada AA; Chen H; Atherall J; Baker-Glenn C; Beresford A; Burdick DJ; Chambers M; Dominguez SL; Drummond J; Gill A; Kleinheinz T; Le Pichon CE; Medhurst AD; Liu X; Moffat J; Nash K; Scearce-Levie K; Sheng Z; Shore D; Van de Poël H; Zhang S; Zhu H; Sweeney Z
ACS Med Chem Lett 2013[Jan]; 4 (1): 85-90 PMID24900567show ga
The modulation of LRRK2 kinase activity by a selective small molecule inhibitor has been proposed as a potentially viable treatment for Parkinson's disease. By using aminopyrazoles as aniline bioisosteres, we discovered a novel series of LRRK2 inhibitors. Herein, we describe our optimization effort that resulted in the identification of a highly potent, brain-penetrant aminopyrazole LRRK2 inhibitor (18) that addressed the liabilities (e.g., poor solubility and metabolic soft spots) of our previously disclosed anilino-aminopyrimidine inhibitors. In in vivo rodent PKPD studies, 18 demonstrated good brain exposure and engendered significant reduction in brain pLRRK2 levels post-ip administration. The strategies of bioisosteric substitution of aminopyrazoles for anilines and attenuation of CYP1A2 inhibition described herein have potential applications to other drug discovery programs.