SITE-SELECTIVE FLUORINATION OF ORGANIC-COMPOUNDS USING 1-ALKYL-4-FLUORO-1,4-DIAZABICYCLO[2.2.2]OCTANE SALTS (SELECTFLUOR REAGENTS)

The new ''N-F''-type electrophilic reagent family of 1-alkyl-4-fluoro-1,4-diazabicyclo[2.2.2]octane salts8d (derived from elemental fluorine (F2) and 1-alkyl-1,4-diazabicyclo[2.2.2]octane salts) has been found to be very effective for the fluorination of a wide variety of organic substrates. These include steroidal enol acetates and silyl enol ethers, phenyl-substituted olefins, sulfides bearing alpha-H atoms, certain carbanions, and mildly activated aromatic compounds. The products were obtained with good yields and regioselectivity under very mild reaction conditions.