Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10594450 | Bioorganic & Medicinal Chemistry Letters | 2012 | 5 Pages |
Abstract
In an effort to better understand the conformational preferences that inform the biological activity of naltrexone and related naltrexol derivatives, a new synthesis of the restricted analog 3-OBn-6β,14-epoxymorphinan 4 is described. 4 was synthesized starting from naltrexone in 50% overall yield, proceeding through the OBn-6α-triflate intermediate 8. Key steps to the synthesis include benzylation (96% yield), reduction (90% yield, α:β:3:2), followed by a one-pot triflation/displacement sequence (96% yield) to yield the desired bridged epoxy derivative 4. X-ray crystallographic analysis of intermediate 3-OBn-6α-naltrexol 7a supports population of the key boat conformation required for the epoxy ring closure. We also report that the 6β-mesylate 10-a high affinity opioid receptor ligand, the epimeric derivative of 11, and an analog of 12-functions as an inverse agonist at the mu opioid receptor using herkinorin pre-conditioned cells and an agonist at the kappa opioid receptor when evaluated in independent in vitro [35S]-GTP-γ-S assays.
Related Topics
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Authors
David J. Martin, Paul E. FitzMorris, Bo Li, Mario Ayestas, Ellicott J. Sally, Christina M. Dersch, Richard B. Rothman, Amy M. Deveau,