Design, synthesis and preclinical evaluation of muscarine receptor antagonists via a scaffold-hopping approach

Marlon Millard,Jonas Kilian,Marius Ozenil, Mariella Mogeritsch, Verena Schwingenschloegl-Maisetschlaeger,Wolfgang Holzer,Marcus Hacker,Thierry Langer,Verena Pichler

EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY(2023)

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摘要
Our research group recently identified a rearrangement product of pirenzepine as starting point for a comprehensive rational drug design approach towards orthosteric muscarinic acetylcholine receptor ligands. Chemical reduction and bioscaffold hop lead to the development of sixteen promising compounds featuring either a benzimidazole or carbamate moiety, all exhibiting comparable pharmacophoric characteristics. The synthesized compounds were characterized by NMR, HR-MS, and RP-HPLC techniques. Subsequent evaluation encompassed binding affinity assessment on CHO-hM1-5 cells, mode of action determination, and analysis of physico-chemical parameters. The CNS MPO score indicated favorable drug-like attributes and potential CNS activity for the antagonistic ligands. The most promising compounds displayed Ki-values within a desirable low nanomolar range, and their structural features allow for potential carbon-11 radiolabeling. Our optimization efforts resulted in compounds with a remarkable 138-fold increase in binding affinity compared to the previously mentioned rearrangement product towards human M5, suggesting their prospective utility in positron emission tomography applications.
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关键词
Muscarinic acetylcholine receptors,Pirenzepine,Orthosteric binding site
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