Transformation of naltrexone into mesembrane and investigation of the binding properties of its intermediate derivatives to opioid receptors

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Abstract

We transformed naltrexone (5) with the morphinan skeleton into mesembrane (4) belonging to the Sceletium alkaloids via key intermediate 6, characterized by a cis-fused hydroindole skeleton with a suspended phenyl ring fixed by an epoxy bridge. We then investigated the binding affinities of 4 and the key intermediate 6 derivatives to the opioid receptors. Among the tested compounds, 15′, with a cis-fused hydroindole core, bound to the three opioid receptor types with strong to moderate affinities. The observed differences of binding affinities among the tested compounds were reasonably explained by the conformational analyses of the compounds. The structure–activity relationship (SAR) of the tested compounds like 15′ with the hydroindole structure was completely different from the reported SAR of morphinan derivatives with the hydroisoquinoline skeleton. Compound 15′ with a structure that differs from the morphinans represents a useful fundamental skeleton with a novel chemotype that may contribute to the development of new opioid ligands.

Journal

  • Bioorganic & medicinal chemistry

    Bioorganic & medicinal chemistry 23(3), 439-448, 2015-02

    Elsevier

Keywords

Codes

  • NII Article ID (NAID)
    120005555623
  • NII NACSIS-CAT ID (NCID)
    AA10938083
  • Text Lang
    ENG
  • Article Type
    journal article
  • ISSN
    0968-0896
  • Data Source
    IR 
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