Synthesis and Evaluation of a18F-Labeled Diarylpyrazole Glycoconjugate for the Imaging of NTS1-Positive Tumors

Aiming to image NTS1 overexpressing tumors, the diarylpyrazole glycoconjugate 8, derived from the potent NTS1 antagonist SR142948A, was synthesized taking advantage of the palladium-catalyzed aminocarbonylation reaction. The glycoconjugate 8 displayed excellent affinity and selectivity toward NTS1. Radiosynthesis proceeded straightforwardly, obtaining (18)F8 with excellent stability and highly beneficial biodistribution in vivo as demonstrated by PET imaging in HT29 tumor-bearing nude mice. Thus, the tracer (18)F8 represents a highly promising candidate for PET imaging of NTS1-positive tumors.