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Ho TC, Tius MA, Nikas SP, Tran NK, Tong F, Zhou H, Zvonok N, Makriyannis A. Oxa-adamantyl cannabinoids. Bioorg Med Chem Lett 2021; 38:127882. [PMID: 33636308 DOI: 10.1016/j.bmcl.2021.127882] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 01/01/2021] [Accepted: 02/12/2021] [Indexed: 11/18/2022]
Abstract
As a continuation of earlier work on classical cannabinoids bearing bulky side chains we report here the design, synthesis, and biological evaluation of 3'-functionalized oxa-adamantyl cannabinoids as a novel class of cannabinergic ligands. Key synthetic steps involve nucleophilic addition/transannular cyclization of aryllithium to epoxyketone in the presence of cerium chloride and stereoselective construction of the tricyclic cannabinoid nucleus. The synthesis of the oxa-adamantyl cannabinoids is convenient, and amenable to scale up allowing the preparation of these analogs in sufficient quantities for detailed in vitro evaluation. The novel oxa-adamantyl cannabinoids reported here were found to be high affinity ligands for the CB1 and CB2 cannabinoid receptors. In the cyclase assay these compounds were found to behave as potent and efficacious CB1 receptor agonists. Isothiocyanate analog AM10504 is capable of irreversibly labeling both the CB1 and CB2 receptors.
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Affiliation(s)
- Thanh C Ho
- Department of Chemistry, University of Hawaii at Manoa, 2545 The Mall, Honolulu, HI 96822, United States
| | - Marcus A Tius
- Department of Chemistry, University of Hawaii at Manoa, 2545 The Mall, Honolulu, HI 96822, United States.
| | - Spyros P Nikas
- Center for Drug Discovery, Department of Chemistry and Chemical Biology, and Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115, United States
| | - Ngan K Tran
- Center for Drug Discovery, Department of Chemistry and Chemical Biology, and Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115, United States
| | - Fei Tong
- Center for Drug Discovery, Department of Chemistry and Chemical Biology, and Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115, United States
| | - Han Zhou
- Center for Drug Discovery, Department of Chemistry and Chemical Biology, and Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115, United States
| | - Nikolai Zvonok
- Center for Drug Discovery, Department of Chemistry and Chemical Biology, and Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115, United States
| | - Alexandros Makriyannis
- Center for Drug Discovery, Department of Chemistry and Chemical Biology, and Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115, United States.
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