反应详情

A mixture containing 5.6 g of 5-bromo-1,6-naphthyridin-2(1H)-one, 12.7 g of 2-methyl-5-nitro-1H-imidazole, 3.45 g of anhydrous potassium carbonate and 50 ml of N-methylpyrrolidinone was refluxed for 5.5 hours, cooled and concentrated in vacuo to remove most of the solvent. To the concentrate was added 100 ml of water and 10 ml of 35% aqueous sodium hydroxide; and, the mixture was treated with decolorizing charcoal and filtered. The filtrate was acidified with acetic acid and the precipitate was collected, washed with water, dried, recrystallized from dimethylformamide, and dried in a vacuum oven at 90°-95° C. to yield 4.5 g of 5-(2-methyl-5-nitro-1H-imidazol-1-yl)-1,6-naphthyridin-2-(1H)-one, m.p. >300° C.

1. temperaturewas refluxed for 5.5 hours
2. temperaturecooled
3. concentrationconcentrated in vacuo
4. customto remove most of the solvent
5. additionTo the concentrate was added 100 ml of water and 10 ml of 35% aqueous sodium hydroxide
6. additionand, the mixture was treated with decolorizing charcoal
7. filtrationfiltered
8. customthe precipitate was collected
9. washwashed with water
10. customdried
11. customrecrystallized from dimethylformamide
12. customdried in a vacuum oven at 90°-95° C.