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Marešová A, Jurášek M, Drašar PB, Dolenský B, Prokudina EA, Shalgunov V, Herth MM, Cumming P, Popkov A. A facile synthesis of precursor for the σ-1 receptor PET radioligand [ 18 F]FTC-146 and its radiofluorination. J Labelled Comp Radiopharm 2024; 67:59-66. [PMID: 38171540 DOI: 10.1002/jlcr.4081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 11/10/2023] [Accepted: 12/07/2023] [Indexed: 01/05/2024]
Abstract
The σ-1 receptor is a non-opioid transmembrane protein involved in various human pathologies including neurodegenerative diseases, inflammation, and cancer. The previously published ligand [18 F]FTC-146 is among the most promising tools for σ-1 molecular imaging by positron emission tomography (PET), with a potential for application in clinical diagnostics and research. However, the published six- or four-step synthesis of the tosyl ester precursor for its radiosynthesis is complicated and time-consuming. Herein, we present a simple one-step precursor synthesis followed by a one-step fluorine-18 labeling procedure that streamlines the preparation of [18 F]FTC-146. Instead of a tosyl-based precursor, we developed a one-step synthesis of the precursor analog AM-16 containing a chloride leaving group for the SN 2 reaction with 18 F-fluoride. 18 F-fluorination of AM-16 led to a moderate decay-corrected radiochemical yield (RCY = 7.5%) with molar activity (Am ) of 45.9 GBq/μmol. Further optimization of this procedure should enable routine radiopharmaceutical production of this promising PET tracer.
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Affiliation(s)
- Anna Marešová
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology Prague, Praha 6, Czech Republic
| | - Michal Jurášek
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology Prague, Praha 6, Czech Republic
| | - Pavel B Drašar
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology Prague, Praha 6, Czech Republic
| | - Bohumil Dolenský
- Department of Analytical Chemistry, University of Chemistry and Technology Prague, Praha 6, Czech Republic
| | - Elena A Prokudina
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology Prague, Praha 6, Czech Republic
| | - Vladimir Shalgunov
- Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
- PET and Cyclotron Unit, Copenhagen University Hospital, Copenhagen, Denmark
| | - Matthias M Herth
- Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | - Paul Cumming
- Department of Nuclear Medicine, University Hospital Bern, Bern, Switzerland
- School of Psychology and Counselling, Queensland University of Technology, Kevin Grove, Queensland, Australia
| | - Alexander Popkov
- Institute of Organic Chemistry, Johannes Kepler University, Linz, Austria
- Samo Biomedical Centre, Pardubice, Czech Republic
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