反应详情

Mixed were 26.8 g of 1-amidino-4-benzylpiperazine sulfate and 133 ml of a 3% ethanol solution of sodium hydroxide, followed by an addition of 17.0 g of ethyl 2-cyano-3-ethoxyacrylate. After being refluxed for 5 hours, the reaction mixture was allowed to cool down. After distilling off ethanol from the reaction mixture, the residue was added with water and ethyl acetate. The resultant mixture was shaken. Precipitated colorless crystals of 2-(4-benzylpiperazino)-5-cyano-4-hydroxypyrimidine were collected by filtration, washed with water and then dried, thereby obtaining 7.4 g of 2-(4-benzylpiperazino)-5-cyano-4-hydroxypyrimidine (yield: 25%).

1. additionMixed
2. temperatureAfter being refluxed for 5 hours
3. temperatureto cool down
4. distillationAfter distilling off ethanol from the reaction mixture
5. additionthe residue was added with water and ethyl acetate
6. customPrecipitated colorless crystals of 2-(4-benzylpiperazino)-5-cyano-4-hydroxypyrimidine
7. filtrationwere collected by filtration
8. washwashed with water
9. customdried