A Pd-catalyzed ortho-selective halogenation of benzoxazinone and quinazolinone scaffolds have been described employing N-halosuccinimide as both halogen source and oxidant reagent via C−H bond activation. This transformation shows high chemo- and rigoselectivitiy and demonstrates a broad range of benzoxazinone and quinazolinone substrates with different functional groups and has been scaled up to gram