反应详情

To a solution of 2.8 g of 1-(m-nitrophenyl)quinazoline-2,4(1H, 3H)-dione and 30 ml of dimethylformamide was added 0.5 g of approximately 55 % sodium hydride, and the solution was stirred for 30 minutes. To this was further added 4.7 g of ethyl iodide and stirring was further continued for 1.5 hours at room temperature. After the reaction was complete, the solvent was distilled off from the mixture under reduced pressure. To the residue obtained was added water to precipitate a crude product, which was then recrystallized from methanol to give 2.7 g of 1-(m-nitrophenyl)-3-ethylquinazoline-2,4 (1H, 3H)-dione as light brown prisms, melting at 193°-194° C.

1. stirringstirring
2. waitwas further continued for 1.5 hours at room temperature
3. distillationthe solvent was distilled off from the mixture under reduced pressure
4. customTo the residue obtained
5. customto precipitate a crude product, which
6. customwas then recrystallized from methanol