The first radiosynthesis of 2-amino-5- F-18 fluoropyridines via a 'minimalist' radiofluorination/palladium-catalyzed amination sequence from anisyl(2-bromo-pyridinyl)iodonium triflate

The synthesis of 2-amino-5-[F-18]fluoropyridines was achieved in 8-85% yields by palladium-catalyzed reaction of 2-bromo-5-[F-18]fluoropyridine with piperidine, dimethylamine, butylamine, methylpiperazine, benzylamine, aniline and 3-aminopyridine. 2-Bromo-5-[F-18]fluoropyridine was obtained by radiofluorination of anisyl(2-bromo-pyridinyl-5)iodonium triflate (88% yield). The radiofluorination step was performed under 'minimalist' conditions to guarantee a successful subsequent amination reaction. (authors)