反应详情

Sodium hydroxide (4.080 g, 102 mmol) was added at ambient temperature to a solution of N-butyl-4-cyano-2-methyl-benzamide (0.919 g, 4.25 mmol) (Example I2) in ethanol (10 ml). The reaction mixture was heated to reflux for 3 hours. The reaction mixture was cooled to ambient temperature and concentrated. The residue was diluted with water and acidified by addition of aqueous hydrochloric acid (concentrated). The precipitate was isolated by filtration and dried at 80° C. for 16 hours to give N-butyl-3-methyl-terephthalamic acid, which was used without further purification. 1H-NMR (DMSO-d6, 400 MHz): 0.97 (3H, t), 1.42 (2H, m), 1.62 (2H, m), 2.48 (3H, s), 3.47 (2H, q), 5.73 (1H, s), 7.45 (1H, d), 7.92 (2H, d), 7.5 (1H, s) ppm.

1. temperatureThe reaction mixture was heated
2. temperatureto reflux for 3 hours
3. concentrationconcentrated
4. additionThe residue was diluted with water
5. additionacidified by addition of aqueous hydrochloric acid (concentrated)
6. customThe precipitate was isolated by filtration
7. customdried at 80° C. for 16 hours