Improved automated one-pot two-step radiosynthesis of (S)-[¹⁸F]FETrp, a radiotracer for PET imaging of indoleamine 2,3-dioxygenase 1 (IDO1).

ABSTRACT:

Background

(S)-[¹⁸F]FETrp is a promising PET radiotracer for imaging IDO1 activity, one of the main enzymes involved in the tryptophan metabolism that plays a key role in several diseases including cancers. To date, the radiosynthesis of this tryptophan analogue remains highly challenging due to partial racemization occurring during the nucleophilic radiofluorination step. This work aims to develop a short, epimerization-free and efficient automated procedure of (S)-[¹⁸F]FETrp from a corresponding enantiopure tosylate precursor.

Results

Enantiomerically pure (S)- and (R)-FETrp references as well as tosylate precursors (S)- and (R)-3 were obtained from corresponding N^a-Boc-(L and D)-tryptophan in 2 and 4 steps, respectively. Manual optimisatio

SUBMITTER: Maisonial-Besset A 

PROVIDER: S-EPMC10987429 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature