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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
2.  Discovery and SAR of Novel mGluR5 Non-Competitive Antagonists Not Based on an MPEP Chemotype 
This Letter describes the discovery and SAR of three novel series of mGluR5 non-competitive antagonists/negative allosteric modulators (NAMs) not based on manipulation of an MPEP/MTEP chemotype. This work demonstrates fundamentally new mGluR5 NAM chemotypes with submicromolar potencies, and the first example of a mode of pharmacology `switch' to provide PAMs with a non-MPEP scaffold.
doi:10.1016/j.bmcl.2009.04.110
PMCID: PMC3177605  PMID: 19443219
3.  3-Cyano-5-fluoro-N-arylbenzamides as negative allosteric modulators of mGlu5: Identification of easily prepared tool compounds with CNS exposure in rats 
Development of SAR in a 3-cyano-5-fluoro-N-arylbenzamide series of non-competitive antagonists of mGlu5 using a functional cell-based assay is described in this letter. Further characterization of selected potent compounds in in vitro assays designed to measure their metabolic stability and protein binding is also presented. Subsequent evaluation of two new compounds in pharmacokinetic studies using intraperitoneal dosing in rats demonstrated good exposure in both plasma and brain samples.
doi:10.1016/j.bmcl.2010.06.064
PMCID: PMC2905502  PMID: 20598884

Results 1-3 (3)