Nitration of 2-chloro-5-fluorotoluene (I) at position 4 afforded nitrocompound (II), which was treated with sodium glycinate (III) to displace the fluoro atom providing (IV). Reduction of the nitro group with concomitant cyclization led to quinoxalinone (V). Finally, reaction with fuming nitric acid produced simultaneous nitration and oxidation to quinoxalinedione.