Abstract
Our drug discovery efforts for N-type calcium channel blockers in the 4-piperidinylaniline series led to the discovery of an orally active analgesic agent 26. 1-[4-Dimethylamino-benzyl)-piperidin-4-yl]-[4-(3,3-dimethyl-butyl)-phenyl]-(3-methyl-but-2-enyl)-amine (26) showed high affinity to functionally block N-type calcium channels (IC50=0.7 μM in the IMR32 assay) and exhibited high efficacy in the anti-writhing analgesia test with mice (ED50=12 mg/kg by po and 4 mg/kg by iv). In this report, the rationale for the design, synthesis, biological evaluation, and pharmacokinetics of this series of blockers is described.
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