反应详情

温度

80 °C

A mixture of 85 g of 4-benzyloxybenzamidine hydrochloride, 78.6 g of dimethyl methoxymalonate, 1700 ml of ethanol, and 187 g of sodium methylate (28% methanol solution) was heated at 80° C. for 4 hours with stirring. After cooling, 1000 ml of acetic acid was slowly added to the reaction mixture, whereupon a yellow crystal precipitated. The precipitated crystals were collected by filtration, washed twice with water until the washing became neutral, and dried at 80° C. for 3 hours in high vacuo to obtain 64.2 g (percent yield: 60.7% ) of 4,6-dihydroxy-5-methoxy-2-(4-benzyloxyphenyl)pyrimidine.

1. temperatureAfter cooling
2. customprecipitated
3. filtrationThe precipitated crystals were collected by filtration
4. washwashed twice with water until the washing
5. customdried at 80° C. for 3 hours in high vacuo