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A suspension of 6-chloropyridazine-3-carboxamide (28.5 g, 0.18 mol) in methanol (200 ml) was treated with aqueous ethylamine (70% solution, 77 ml). The reaction was heated at reflux for 3½ hours. The reaction was allowed to cool to ambient temperature and stand overnight. The precipitate was filtered and washed with a small volume of water and dried to give 6-(ethylamino)pyridazine-3-carboxamide as pink solid (8.9 g). [The filtrates were evaporated to a small volume diluted with cold water (100 ml) and more of the desired solid was filtered-off, washed with water and dried (12.8 g). Total yield (21.7 g, 72%)].

1. temperatureThe reaction was heated
2. temperatureat reflux for 3½ hours
3. filtrationThe precipitate was filtered
4. washwashed with a small volume of water
5. customdried