High-affinity carbamate analogues of morphinan at opioid receptors.

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Peng X, Knapp BI, Bidlack JM, Neumeyer JL

High-affinity carbamate analogues of morphinan at opioid receptors.

Bioorg Med Chem Lett. 2007 Mar 15;17(6):1508-11. Epub 2007 Jan 17.

PubMed ID

17276685 [ View in PubMed

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Abstract

A series of carbamate analogues were synthesized from levorphanol (1a), cyclorphan (2a) or butorphan (3a) and evaluated in vitro for their binding affinity at mu, delta, and kappa opioid receptors. Functional activities of these compounds were measured in the [(35)S]GTPgammaS binding assay. Phenyl carbamate derivatives 2d and 3d showed the highest binding affinity for kappa receptor (K(i)=0.046 and 0.051 nM) and for mu receptor (K(i)=0.11 and 0.12 nM). Compound 1c showed the highest mu selectivity. The preliminary assay for agonist and antagonist properties of these ligands in stimulating [(35)S]GTPgammaS binding mediated by the kappa opioid receptor illustrated that all of these ligands were kappa agonists. At the mu receptor, compounds 1b, 1c, 2b, and 3b were agonists, while compounds 2c-e and 3c-e were mu agonists/antagonists.

DrugBank Data that Cites this Article

Binding Properties

Drug	Target	Property	Measurement	pH	Temperature (°C)
Levorphanol	Kappa-type opioid receptor	Ki (nM)	2.3	N/A	N/A	Details
Levorphanol	Mu-type opioid receptor	Ki (nM)	0.21	N/A	N/A	Details