反应详情

温度

-78 °C

To a stirred solution of 26.9 ml of n-butyllithium (2.5 M in hexane) in 50 ml of THF at −78° C. was added a 3.51 ml of acetonitrile in 20 ml of THF during 10 min. After stirring at −78° C. for 30 min, the mixture was treated with 10 g of methyl 4-benzyloxy-2-(dimethylaminomethyleneamino)-5-methoxybenzoate in 20 ml of THF during 5 min. After 15 min at −78° C. the stirred mixture was warmed to 0° C. for a further 30 min. It was then treated with 5 ml of acetic acid, warmed to 25° C. and stirred for 30 min. The mixture was evaporated to dryness, and diluted with aqueous sodium bicarbonate. The resulting off-white solid was filtered, washed with water, ethyl acetate and ether. After drying, 4.5 g of 7-benzyloxy-4-hydroxy-6-methoxy-quinoline-3-carbonitrile was obtained as an off-white solid, dec >255° C.; mass spectrum (electrospray, m/e) M+H 307.

1. temperatureAfter 15 min at −78° C. the stirred mixture was warmed to 0° C. for a further 30 min
2. temperaturewarmed to 25° C.
3. stirringstirred for 30 min
4. customThe mixture was evaporated to dryness
5. additiondiluted with aqueous sodium bicarbonate
6. filtrationThe resulting off-white solid was filtered
7. washwashed with water, ethyl acetate and ether
8. customAfter drying