反应详情

温度

90 °C

To 9.93 ml of water were added 10.0 g (62.1 mmol) of 5-methylisatin obtained in Example 1 and 4.96 g (0.12 mol) of sodium hydroxide. 10.2 g (62.1 mmol) of 2-acetylbenzoic acid was added thereto and the mixture was heated to 90° C. under reflux. The mixture was heated further at 115° C. for one hour after the reaction became mild. Thereafter, the mixture was allowed to cool to room temperature and poured into 200 g of iced water. The aqueous layer was washed with ether and acidified with 2M hydrochloric acid. The formed precipitate was collected by filtration to obtain 6.55 g of 2-(2-carboxyphenyl)-6-methyl-4-quinolinecarboxylic acid. NMR (270 MHz, Acetone-d6):

1. temperatureunder reflux
2. temperatureThe mixture was heated further at 115° C. for one hour after the reaction
3. temperatureto cool to room temperature
4. washThe aqueous layer was washed with ether
5. filtrationThe formed precipitate was collected by filtration