Fragment-based labeling using condensation reactions of six potential 5-HT 7 R PET tracers

In this work, a fragment-based labeling procedure was developed based on condensation reactions. Six 18 F-labeled (arylpiperazinyl-butyl)oxindole derivatives were synthesized. These structures are interesting lead compounds with respect to development of a 5-HT 7 R PET tracer. They were radiolabeled in sufficient radiochemical yields, purities and molar activities for future in vivo evaluation in rodents.