Bioorganic and Medicinal Chemistry Letters p. 6987 - 6991 (2011)
Update date:2022-08-16
Topics:
Arumugam, Selvanathan
Chin, Joshua
Schirrmacher, Ralf
Popik, Vladimir V.
Kostikov, Alexey P.
N-Terminally azido-modified peptides were labeled with the novel prosthetic labeling synthon [18F]azadibenzocyclooctyne ([18F]ADIBO) using copper-free azide-alkyne [3+2]-dipolar cycloaddition in high radiochemical yields (RCYs). 18F-Labeled [18F]ADIBO was prepared by nucleophilic substitution of the corresponding tosylate in 21% overall RCY (EOB) in a fully automated synthesis unit within 55 min. [18F]ADIBO was incubated with azide-containing peptides at room temperature in the absence of toxic metal catalysts and the formation of the triazole conjugate was confirmed. Finally, the azide-alkyne [3+2]-dipolar cycloaddition was shown to proceed with 95% radiochemical yield in ethanol within 30 min, allowing for a development of a kit-like peptide labeling approach with [18F]ADIBO.
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