Add time:08/30/2019         Source:sciencedirect.com

A novel series of 4-phenyl-4-[1H-imidazol-2-yl]-piperidine derivatives has been prepared and their synthesis described herein. In vitro affinities for δ-, μ-, and κ-opioid receptors, as well as the functional activity in the [35S]GTPγS assay are reported. The most potent and selective δ-opioid agonist 18a exhibited a Ki of 18 nM, and was >258-fold and 28-fold selective over μ- and κ-receptors, respectively; the compound is a full agonist with an EC50 value of 14 nM.

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