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Related Experiment Videos

Spiropiperidines as high-affinity, selective sigma ligands.

M S Chambers1, R Baker, D C Billington

  • 1Chemistry Department, Merck Sharp and Dohme Research Laboratories, Harlow, Essex, U.K.

Journal of Medicinal Chemistry
|May 29, 1992
PubMed
Summary

Researchers synthesized novel spirocyclic piperidines to study sigma receptors. Optimized compounds showed high affinity and selectivity for the sigma site, offering a valuable tool for physiological research.

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Area of Science:

  • Medicinal Chemistry
  • Neuropharmacology
  • Organic Synthesis

Background:

  • Sigma receptors are implicated in various physiological processes.
  • Understanding sigma receptor function requires selective ligands.
  • Conformationally restricted compounds can offer unique pharmacological profiles.

Purpose of the Study:

  • To synthesize and characterize novel achiral, conformationally restricted spirocyclic piperidines.
  • To investigate the structure-activity relationships of these compounds at the sigma recognition site.
  • To identify high-affinity and selective sigma receptor ligands.

Main Methods:

  • Synthesis of a series of achiral spirocyclic piperidines with diverse lipophilic N-substituents.
  • In vitro assessment of ligand affinity using radioligand displacement assays.

Related Experiment Videos

  • Utilized [3H]-N,N'-di-o-tolylguanidine ([3H]-DTG) as the sigma-specific radioligand.
  • Evaluated selectivity against dopamine D2 receptors.

    • Main Results:

    • Several spirocyclic piperidines demonstrated high affinity for the sigma site.
    • N-butyl and N-dimethylallyl substituents were identified as optimal for high affinity and selectivity.
    • Compound 48 exhibited potent sigma receptor binding (pIC50 = 8.9 vs [3H]-6) and >10,000-fold selectivity over dopamine D2 receptors.
    • Achieved among the highest affinities reported for sigma ligands to date.

    Conclusions:

    • The synthesized spirocyclic piperidines represent a promising class of high-affinity, selective sigma receptor ligands.
    • These compounds possess excellent selectivity over dopamine D2 receptors.
    • The developed ligands may serve as valuable pharmacological tools for elucidating the physiological roles of sigma receptors.