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Ruthenium(II)‐catalysed Functionalisation of CH Bonds via a Six‐membered Cyclometallate: Monoarylation of Aryl 2‐pyridyl Ketones

Selective monoarylation of aryl 2‐pyridyl ketones with a variety of arylbromides via arene sp2 CH bond activation/functionalisation is achieved with a [RuCl2(p‐cymene)]2/ p‐CF3C6H4CO2H catalytic system. The reaction via a 6‐membered ruthenacycle is more difficult to perform than via a 5‐membered cyclometallate but the activation of only one ortho CH bond is unprecedentedly highly selective. A variety of functional 2‐pyridine derivatives are easily obtained. It is shown via H/D exchange that the carboxylic acid favours the reversible CH bond activation.