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1.  Discovery, Synthesis, SAR Development of a Series of N-4-(2,5-dioxopyrrolidin-1-yl)-phenylpicolinamides (VU0400195, ML182): Characterization of a Novel Positive Allosteric Modulator of the Metabotropic Glutamate Receptor 4 (mGlu4) with Oral Efficacy in an anti-Parkinsonian Animal Model 
Journal of medicinal chemistry  2011;54(21):7639-7647.
There is an increasing amount of literature data showing the positive effects on preclinical anti-Parkinsonian rodent models with selective positive allosteric modulators of metabotropic glutamate receptor 4 (mGlu4).1 However, most of the data generated utilize compounds that have not been optimized for drug-like properties and, as a consequence, they exhibit poor pharmacokinetic properties and thus do not cross the blood-brain barrier. Herein, we report on a series of N-4-(2,5-dioxopyrrolidin-1-yl)-phenylpicolinamides with improved PK properties with excellent potency and selectivity as well as improved brain exposure in rodents. Finally, ML182 was shown to be orally active in the haloperidol induced catalepsy model, a well-established anti-Parkinsonian model.
doi:10.1021/jm200956q
PMCID: PMC3226828  PMID: 21966889
metabotropic glutamate receptors; mGlu4; positive allosteric modulators; Parkinson’s disease; haloperidol-induced catalepsy; structure-activity relationship (SAR); oral efficacy; brain penetration

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