An easily effected aromatic annulation is described, involving the reaction of arylimidoyl radicals with diethyl azodicarboxylate to give 1,2-dihydro-1,2-dihydro-1,2-diethoxycarbonyl-benzo- and -pyrido-1,2,4-triazines.
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Leardini et al. (1989) studied this question.