1. Discovery and SAR of a novel series of potent, CNS penetrant M4 PAMs based on a non-enolizable ketone core: Challenges in disposition.
- Author
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Wood, Michael R., Noetzel, Meredith J., Tarr, James C., Rodriguez, Alice L., Lamsal, Atin, Chang, Sichen, Foster, Jarrett J., Smith, Emery, Chase, Peter, Hodder, Peter S., Engers, Darren W., Niswender, Colleen M., Brandon, Nicholas J., Wood, Michael W., Duggan, Mark E., Conn, P. Jeffrey, Bridges, Thomas M., and Lindsley, Craig W.
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STRUCTURE-activity relationships , *ALLOSTERIC regulation , *HIGH throughput screening (Drug development) , *METABOLITES , *KETONES - Abstract
This Letter describes the chemical optimization of a novel series of M 4 PAMs based on a non-enolizable ketone core, identified from an MLPCN functional high-throughput screen. The HTS hit was potent, selective and CNS penetrant; however, the compound was highly cleared in vitro and in vivo. SAR provided analogs for which M 4 PAM potency and CNS exposure were maintained; yet, clearance remained high. Metabolite identification studies demonstrated that this series was subject to rapid, and near quantitative, reductive metabolism to the corresponding secondary alcohol metabolite that was devoid of M 4 PAM activity. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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