反应详情

20 g of 5-aminouracil (40 mmol), 80 ml of 20% HCl and 4 ml of crotonaldehyde (50 mmol) were heated together under reflux for 1 hour. The solution was evaporated to dryness under rotarary evaporation. Water was added to the residue so as to make the mixture just stirtable and then it was triturated with ammonium hydroxide with strong stirring until the pH increased to 10-11. Stirring was continued for another 10 minutes. The precipitate was filtered and was washed with minimal methanol and then chloroform and dried to give 17.58 g (63%) of 1.

1. temperatureunder reflux for 1 hour
2. customThe solution was evaporated to dryness under rotarary evaporation
3. additionWater was added to the residue so as
4. customit was triturated with ammonium hydroxide
5. temperatureincreased to 10-11
6. stirringStirring
7. filtrationThe precipitate was filtered
8. washwas washed with minimal methanol
9. dry with materialchloroform and dried