Concise Entries to 4-Halo-2-pyridones and 3-Bromo-4-halo-2-pyridones

Methods for the synthesis of both simple 4-halo-2-pyridones and more functionalized 3,4-di- and (3,4,5-tri)-halo-2-pyridones are described that are based on a combination of Sandmeyer and regioselective (copper-mediated) halogenation, with a 2-chloro or a 2-benzyl­oxy moiety serving as a masked 2-pyridone.