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A stirred suspension of 11.1 g (49.3 mmol) of 2-carboxy-5-nitrobenzeneacetamide in 99 ml of 1,2-dichlorobenzene is refluxed for 3 h. The residue obtained after evaporation of the solvent under vacuum is washed with ether and dried to give 7.34 g (72%) of a tan solid, mp 255-260° (dec); 1H NMR (DMSO-d6) δ 11.6 (s, 1H), 8.2-8.3 (m, 3H), 4.17 (s, 2H); MS (ES−) m/z 205.2 (M−H)−

1. temperatureis refluxed for 3 h
2. customThe residue obtained
3. customafter evaporation of the solvent under vacuum
4. washis washed with ether
5. customdried