Journal
JOURNAL OF LABELLED COMPOUNDS & RADIOPHARMACEUTICALS
Volume 50, Issue 5-6, Pages 452-454Publisher
WILEY
DOI: 10.1002/jlcr.1190
Keywords
fluorinated aromatics; fluorine-18; hypervalent iodine
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Fluorine- 18 labelled fluoropyridines have found increasing application in the medical imaging technique of Positron Emission Tomography. The fluorine-18 has largely been restricted to the 2- and 6-position where its introduction may be readily achieved, from a range of appropriate precursors, by nucleophilic aromatic substitution using [F-18]fluoride. However, fluorine at this position may be labile in vivo limiting the potential of the radiotracer. To date the more stable 3-fluoro and 5-fluoropyridines have not been exploited due to unsuitable methods of preparation. Pyridyliodonium salts provide a convenient way to overcome this restriction and allow the introduction of fluorine- 18, as fluoride, into the 3- or 5-position. Copyright (C) 2007 John Wiley & Sons, Ltd.
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