Synthesis and biological evaluation of a technetium-99m(I)-tricarbonyl-labelled phenyltropane derivative

A new tropane derivative was synthesized by combining a tridentate ligand, N-(2-picolylamine)-N-acetic acid (2-PAA), and a phenyltropane derivative. It was labelled with a [99mTc(CO)3]+ moiety, resulting in the formation of two stable and neutral lipophilic isomers. Their identity was confirmed using radio-LC–MS. In normal mice, no brain uptake was observed for any of the isomers and in vitro autoradiography using mouse brain sections showed no specific uptake in the striatal area.