ChemMedChem p. 1625 - 1628 (2018)
Update date:2022-08-16
Topics:
Murrell, Emily
Kovacs, Michael S.
Luyt, Leonard G.
A new fluorine-containing azadibenzocyclooctyne (ADIBO-F) was designed using a synthetically accessible pathway. The fluorine-18 prosthetic group was prepared from its toluenesulfonate precursor and isolated in 21–35 % radiochemical yield in 30 minutes of synthetic time. ADIBO-F has been incorporated into azide-functionalized, cancer-targeting peptides through a strain-promoted alkyne–azide cycloaddition with high radiochemical yields and purities. The final products are novel peptide-based positron emission tomography (PET) imaging agents that possess high affinities for their targets, growth hormone secretagogue receptor 1a (GHSR-1a) and gastrin-releasing peptide receptor (GRPR), with IC50 values of 9.7 and 0.50 nm, respectively. This is a new and rapid labelling option for the incorporation of fluorine-18 into biomolecules for PET imaging.
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