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Salvinorin B meth-oxy-methyl ether.

Thomas A Munro1, Douglas M Ho, Bruce M Cohen

  • 1McLean Hospital, Belmont, MA, USA ; Harvard Medical School, Department of Psychiatry, Boston, MA, USA.

Acta Crystallographica. Section E, Structure Reports Online
|January 4, 2013
PubMed
Summary
This summary is machine-generated.

Methylated Salvinorin B (MOM-SalB) is a potent kappa-opioid derivative. Its unique MOM ether conformation allows for structural overlap with salvinorin A, explaining enhanced activity and aiding receptor model evaluation.

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Area of Science:

  • Medicinal Chemistry
  • Pharmacology
  • Structural Biology

Background:

  • Salvinorin A is a potent kappa-opioid receptor (KOR) agonist.
  • Derivatives of salvinorin A are being explored to enhance its pharmacological profile.
  • Understanding structure-activity relationships is crucial for developing novel KOR modulators.

Purpose of the Study:

  • To synthesize and characterize a novel salvinorin A derivative, MOM-SalB.
  • To investigate the structural basis for MOM-SalB's enhanced potency, selectivity, and duration of action compared to salvinorin A.
  • To explore the conformational preferences of MOM ethers in KOR ligands.

Main Methods:

  • Synthesis of methyl (2S,4aR,6aR,7R,9S,10aS,10bR)-2-(3-fur-yl)-9-meth-oxy-meth-oxy-6a,10b-dimethyl-4,10-dioxo-2,4a,5,6,7,8,9,10a-octa-hydro-1H-benzo[f]isochromene-7-carboxyl-ate (MOM-SalB).
  • X-ray crystallography to determine the crystal structure of MOM-SalB.
  • Superimposition of MOM-SalB and salvinorin A crystal structures.
  • Conformational analysis of the MOM ether moiety.

Main Results:

  • MOM-SalB exhibits enhanced potency, selectivity, and duration of action compared to salvinorin A.
  • Crystal structure analysis revealed an unexpected overlap between MOM-SalB's MOM group and salvinorin A's acetate group.
  • This isosterism is attributed to the MOM ether adopting a 'classic anomeric' (gauche-gauche) conformation.
  • This conformation was not observed in a less potent tetra-hydro-pyranyl ether derivative.

Conclusions:

  • The 'classic anomeric' conformation of the MOM ether in MOM-SalB is key to its enhanced pharmacological properties.
  • This structural insight provides a rationale for the improved activity of MOM-SalB over other derivatives.
  • The findings may aid in developing more effective models of the activated kappa-opioid receptor.