Add time:09/02/2019 Source:sciencedirect.com
We synthesized derivatives of the δ opioid receptor (DOR) antagonists naltrindole (NTI) and compound 1 that were modified with small alkyl or fluorinated ethyl substituents on the 17-nitrogen. Although the derivatives showed decreased binding affinities for the opioid receptors, their selectivities for the DOR were higher than the parent compounds NTI and compound 1. Surprisingly, 17-fluoroethyl NTI derivatives exerted DOR inverse agonistic activities. The DOR inverse agonism of compounds 4c–e was less efficacious but significant, as compared with a standard DOR inverse agonist ICI-174864. On the other hand, compound 1 and its derivatives with small alkyl or monofluoroethyl substituents were partial agonists, but the derivatives having di- or trifluoroethyl group showed neither agonistic nor inverse agonistic activities.
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