Sulfur [ 18 F]Fluoride Exchange Click Chemistry Enabled Ultrafast Late-Stage Radiosynthesis

Le résumé fourni par la source

The lack of efficient [ 18 F]fluorination processes and target-specific organofluorine chemotypes remains the major challenge of fluorine-18 positron emission tomography (PET). We report here an ultrafast isotopic exchange method for the radiosynthesis of novel PET agent aryl [ 18 F]fluorosulfate enabled by the emerging sulfur fluoride exchange (SuFEx) click chemistry. The method has been applied to the fully automated 18 F-radiolabeling of 25 structurally and functionally diverse aryl fluorosulfates with excellent radiochemical yield (83–100%, median 98%) and high molar activity (280 GBq μmol –1 ) at room temperature in 30 s. The purification of radiotracers requires no time-consuming HPLC but rather a simple cartridge filtration. We further demonstrate the imaging application of a rationally designed poly(ADP-ribose) polymerase 1 (PARP1)-targeting aryl [ 18 F]fluorosulfate by probing subcutaneous tumors in vivo .

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