反应详情

温度

80 °C

Into a solution of 3.45 g (150 mmol) of sodium in 100 ml methanol, here were sequentially added 10.98 g (47 mmol) 4-bromobenzamidine hydrochloride and 11.15 g (47 mmol) of phenyl malonic acid ethyl ester. The mixture was heated for 12 hours at 80° C. The deep yellow reaction solution was filtered to remove the precipitated sodium chloride and thereafter the pyrimidine was precipitated with 10 ml of 2 molar hydrochloric acid as an intensive yellow solid. The solid was sequentially washed with water, ethanol and diethyl ether. Yield: 12.70 g (37 mmol, 79% theory) of yellow solid. The pyrimidine is insoluble in all tested organic solvents as well as in water. m.p. greater >230° C.

1. filtrationThe deep yellow reaction solution was filtered
2. customto remove the precipitated sodium chloride
3. customthe pyrimidine was precipitated with 10 ml of 2 molar hydrochloric acid as an intensive yellow solid
4. washThe solid was sequentially washed with water, ethanol and diethyl ether
5. customm.p. greater >230° C.