Abstract
Ring-closing metathesis has emerged as a powerful tool in organic synthesis for generating cyclic structures via C-C double bond formation. Recently, it has been successfully used in peptide chemistry for obtaining cyclic molecules bridged through an olefin unit in place of the usual disulfide bond. Here, we describe this approach for obtaining cyclic olefin bridged analogues of H-Tyr-c[D-Cys-Gly-Phe-Cys]-OH. The synthesis of the new ligands was performed using the second generation Grubbs' catalyst. The resulting cis-8 (cDADAE) and trans-9 (tDADAE) were fully characterized and tested at delta, mu, and kappa opioid receptors. Also the linear precursor 13 (lDADAE) and the hydrogenated derivative 11 (rDADAE) also were tested. All the cyclic products containing a olefinic bond are slightly selective but highly active and potent for the delta and mu opioid receptors. Activity toward the kappa opioid receptors was absent or very low.
Publication types
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Research Support, N.I.H., Extramural
MeSH terms
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Allyl Compounds / chemical synthesis*
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Allyl Compounds / chemistry
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Allyl Compounds / pharmacology
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Animals
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Enkephalins / chemical synthesis*
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Enkephalins / chemistry
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Enkephalins / pharmacology
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Guinea Pigs
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Ileum / drug effects
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Ileum / innervation
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Ileum / physiology
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In Vitro Techniques
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Male
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Mice
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Mice, Inbred ICR
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Muscle Contraction / drug effects
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Muscle, Smooth / drug effects
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Muscle, Smooth / physiology
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Myenteric Plexus / physiology
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Peptides, Cyclic / chemical synthesis*
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Peptides, Cyclic / chemistry
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Peptides, Cyclic / pharmacology
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Radioligand Assay
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Receptors, Opioid, delta / agonists*
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Receptors, Opioid, delta / metabolism
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Receptors, Opioid, kappa / metabolism
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Receptors, Opioid, mu / agonists*
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Receptors, Opioid, mu / metabolism
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Structure-Activity Relationship
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Vas Deferens / drug effects
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Vas Deferens / physiology
Substances
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Allyl Compounds
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Enkephalins
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Peptides, Cyclic
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Receptors, Opioid, delta
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Receptors, Opioid, kappa
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Receptors, Opioid, mu