反应详情

温度

-78 °C

A mixture of 4.82 g of methyl 3,4,5-trimethoxyanthranilate in 20 ml of N,N-dimethylformamide dimethyl acetal was refluxed for 18 hours and concentrated in vacuo. The crude amidine product was used in the next step without further purification. To 25 ml of tetrahydrofuran at -78° C. was added 17.6 ml of 2.5M n-butyllithium in hexanes. Then 2.35 ml of acetonitrile in 45 ml of tetrahydrofuran was added dropwise. The mixture was stirred at -78° C. for 15 minutes. Then a solution of the crude amidine in 30 ml of tetrahydrofuran was added dropwise. The mixture was stirred at -78° C. for minutes, then 5.7 ml of acetic acid was added. The mixture was warmed to room temperature, and 100 ml of water was added. The product was collected, washed with water, and dried to give 4.14 g of 4-hydroxy-6,7,8-trimethoxy-quinoline-3-carbonitrile as a solid, mp 280° C. (decomposed); mass spectrum (electrospray, m/e): M+H 261.2.

1. temperaturewas refluxed for 18 hours
2. concentrationconcentrated in vacuo
3. customThe crude amidine product was used in the next step without further purification
4. additionTo 25 ml of tetrahydrofuran at -78° C. was added 17.6 ml of 2.5M n-butyllithium in hexanes
5. additionThen 2.35 ml of acetonitrile in 45 ml of tetrahydrofuran was added dropwise
6. additionThen a solution of the crude amidine in 30 ml of tetrahydrofuran was added dropwise
7. stirringThe mixture was stirred at -78° C. for minutes
8. addition5.7 ml of acetic acid was added
9. temperatureThe mixture was warmed to room temperature
10. addition100 ml of water was added
11. customThe product was collected
12. washwashed with water
13. customdried