Discovery and optimization of 3-(4-aryl/heteroarylsulfonyl)piperazin-1-yl)-6-(piperidin-1-yl)pyridazines as novel,CNS penetrant pan-muscarinic antagonists |
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Authors: | Aaron M Bender Rebecca L Weiner Vincent B Luscombe Sonia Ajmera Hyekyung P Cho Sichen Chang Xiaoyan Zhan Alice L Rodriguez Colleen M Niswender Darren W Engers Thomas M Bridges P Jeffrey Conn Craig W Lindsley |
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Institution: | 1. Vanderbilt Center for Neuroscience Drug Discovery, Vanderbilt University School of Medicine, Nashville, TN 37232, USA;2. Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA;3. Department of Chemistry, Vanderbilt University, Nashville, TN 37232, USA;4. Vanderbilt Kennedy Center, Vanderbilt University School of Medicine, Nashville, TN 37232, USA |
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Abstract: | This letter describes the synthesis and structure activity relationship (SAR) studies of structurally novel M4 antagonists, based on a 3-(4-aryl/heteroarylsulfonyl)piperazin-1-yl)-6-(piperidin-1-yl)pyridazine core, identified from a high-throughput screening campaign. A multi-dimensional optimization effort enhanced potency at human M4 (hM4 IC50s < 200 nM), with only moderate species differences noted, and with enantioselective inhibition. Moreover, CNS penetration proved attractive for this series (rat brain:plasma Kp = 2.1, Kp,uu = 1.1). Despite the absence of the prototypical mAChR antagonist basic or quaternary amine moiety, this series displayed pan-muscarinic antagonist activity across M1-5 (with 9- to 16-fold functional selectivity at best). This series further expands the chemical diversity of mAChR antagonists. |
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Keywords: | Pyridazine Muscarinic acetylcholine receptor DMPK Structure-activity relationship (SAR) |
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