反应详情

温度

150 °C

Ethyl N-(2-carbamoyl-5-chlorophenyl)aminoacetate (357 g) and N,N'-carbonyldiimidazole (451 g) were dissolved in 1,4-dioxane (1.5 l) and 1,4-dioxane was concentrated to a bout 0.5 l by distillation. The resulting mixture was stirred at 150° C. for 30 minutes. After cooling, the precipitated crystals were collected by filtration and washed with ethanol to give ethyl 2-(7-chloro-1,2,3,4-tetrahydro-2,4-dioxoquinazolin-1-yl)acetate (353 g).

1. concentration1,4-dioxane was concentrated to a bout 0.5 l by distillation
2. temperatureAfter cooling
3. filtrationthe precipitated crystals were collected by filtration
4. washwashed with ethanol