Chemoselective radiosyntheses of electron-rich [ 18 F]fluoroarenes from aryl(2,4,6-trimethoxyphenyl)iodonium tosylates.

Hypervalent diaryliodonium salts have been used to produce various [18 F]fluoroarenes. The iodonium salt approach as a labeling precursor has been established to equally afford complex 18 F-fluorinated molecules. Because of the inherent two-aryl ring system connected to a central iodine atom, safeguarding the chemoselectivity during radiofluorination using diaryliodonium salts is important. Herein, we introduce a superior chemoselective radiosynthesis of [18 F]fluoroarenes using an aryl(2,4,6-trimethoxyphenyl)iodonium tosylate as a precursor for 18 F-incorporation, even on electron-rich aryl rings.