[NH2:1][C:2]1[CH:3]=[N:4][CH:5]=[CH:6][CH:7]=1.C(N(CC)CC)C.[N+:15]([C:18]1[CH:19]=[C:20]([CH:24]=[CH:25][CH:26]=1)[C:21](Cl)=[O:22])([O-:17])=[O:16]>O1CCCC1.O>[N+:15]([C:18]1[CH:19]=[C:20]([CH:24]=[CH:25][CH:26]=1)[C:21]([NH:1][C:2]1[CH:3]=[N:4][CH:5]=[CH:6][CH:7]=1)=[O:22])([O-:17])=[O:16]A solution of 3-aminopyridine (2 g, 20 mmol) in tetrahydrofuran (100 ml) was treated at 0° C. with triethylamine (3 ml, 2.2 g, 22 mmol) and then a solution of 3-nitrobenzoyl chloride (3.7 g, 20 mmol) in tetrahydrofuran (50 ml). After 0.5 h the reaction mixture was diluted with water (400 ml) and set aside in the fridge for 3 days. Filtration and drying afforded the title compound as a purple crystalline solid (4.82 g, 99%).
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