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 [(35)S]-GTP-γ-S assays.
journal_name
Bioorg Med Chem Lettjournal_title
Bioorganic & medicinal chemistry lettersauthors
Martin DJ,FitzMorris PE,Li B,Ayestas M,Sally EJ,Dersch CM,Rothman RB,Deveau AMdoi
10.1016/j.bmcl.2012.06.056subject
Has Abstractpub_date
2012-11-15 00:00:00pages
6801-5issue
22eissn
0960-894Xissn
1464-3405pii
S0960-894X(12)00807-4journal_volume
22pub_type
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