反应详情

10 g. of 3-ethyl-2,6-dimethyl-4-oxo-4H-pyrido(1,2-a)pyrimidine are dissolved in 100 ml. of acetone with heating and a solution of 7 g. of salicylic acid in 100 ml. of acetone is added. The reaction mixture is brought to a boil, then cooled. The precipitated crystals are filtered off, washed with acetone and dried. 11.5 g. (67.6%) of 3-ethyl-2,6-dimethyl-4-oxo-4H-pyrido(1,2-a)pyrimidinium salicylate are obtained, melting at 126° to 128° C. after recrystallization from ethanol.

1. temperaturecooled
2. filtrationThe precipitated crystals are filtered off
3. washwashed with acetone
4. customdried