Journal
MOLECULES
Volume 24, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/molecules24010023
Keywords
carbonic anhydrase IX; Ga-68-labeling; click reaction; compound library
Funding
- Leenaards Foundation [3699]
- NSERC
- Department of Radiology and Nuclear Medicine at Erasmus MC
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We herein describe a flexible synthesis of a small library of Ga-68-labeled CAIX-targeted molecules via an orthogonal 2-cyanobenzothiazole (CBT)/1,2-aminothiol click reaction. Three novel CBT-functionalized chelators (1-3) were successfully synthesized and labeled with the positron emitter gallium-68. Cross-ligation between the pre-labeled bifunctional chelators (BFCs) and the 1,2-aminothiol-acetazolamide derivatives (8 and 9) yielded six new Ga-68-labeled CAIX ligands with high radiochemical yields. The click reaction conditions were optimized to improve the reaction rate for applications with short half-life radionuclides. Overall, our methodology allows for a simple and efficient radiosynthetic route to produce a variety of Ga-68-labeled imaging agents for tumor hypoxia.
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