Abstract
Radiolabeled 1,2,4,5-tetrazines are powerful heterocyclic agents for bioorthogonal PET imaging due to their fast cycloaddition with trans-cyclooctenes. However, fluorine-18 radiolabeling of highly reactive tetrazines is often not feasible due to limited compound stability. We demonstrate that post-radiolabeling oxidation of thioether functionalities is a viable and transferable strategy to avoid these limitations, enabling the synthesis of highly reactive 18F-tetrazines.Graphical abstract
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