反应详情

A 500-mL four-necked flask equipped with a mechanical stirrer, thermocouple, condenser, side-arm addition funnel and sodium hydroxide/sodium hypochlorite scrubber was charged with 2-amino-5-bromo-N,3-dimethylbenzamide (prepared by the method of Reference Example 1) (24.6 g, 0.10 mol, 99% purity) and mesitylene (100 g) while maintaining an atmosphere of nitrogen through a gas inlet line connected to the condenser. The mixture was stirred at room temperature and sodium cyanide (ground to a powder just prior to use) (7.7 g, 0.15 mol, assuming 95% purity), copper(I) iodide (2.9 g, 0.015 mol, 98% purity) and 1-butyl-1H-imidazole (7.6 g, 0.06 mol, 98% purity) were added, after which time the nitrogen inlet line was attached directly to the reaction flask. The reaction mixture was heated at reflux (about 166-170° C.) for 6.75 h, while venting through the scrubber. After cooling to 25° C., water (100 mL) was added to the reaction mixture and stirring was continued for 1 h. The mixture was filtered, and the solid collected was washed with water (3×50 mL), mesitylene (50 g) and dried to a constant weight in a vacuum-oven at 55° C. to give the title compound as a light yellow solid (17.7 g).

1. customA 500-mL four-necked flask equipped with a mechanical stirrer
2. additionthermocouple, condenser, side-arm addition funnel
3. temperaturewhile maintaining an atmosphere of nitrogen through a gas inlet line
4. temperatureThe reaction mixture was heated
5. temperatureat reflux (about 166-170° C.) for 6.75 h
6. temperatureAfter cooling to 25° C.
7. stirringstirring
8. filtrationThe mixture was filtered
9. customthe solid collected
10. washwas washed with water (3×50 mL), mesitylene (50 g)
11. customdried to a constant weight in a vacuum-oven at 55° C.