反应详情

4-Amino-3-fluorophenol (5.7 g) was dissolved in dimethyl sulfoxide (57 ml) under a nitrogen stream, potassium tert-butoxide (5.6 g) was added at room temperature, and the reaction mixture was stirred for 15 minutes. 4-Chloropyridine-2-carboxamide (5.0 g) was added to the reaction mixture, followed by stirring in an oil bath at 80° C. (external temperature) under a nitrogen stream for 50 minutes. The reaction mixture was allowed to cool down to room temperature. A 1N aqueous solution of sodium hydroxide (85.5 ml) was added to the reaction mixture, followed by stirring. The precipitated solid was collected by filtration and washed with water. The residue was dried under aeration and then dried by hot air at 100° C. to give the title compound (5.88 g, 74.3%) as pale brown powder.

1. additionwas added at room temperature
2. stirringby stirring in an oil bath at 80° C. (external temperature) under a nitrogen stream for 50 minutes
3. stirringby stirring
4. filtrationThe precipitated solid was collected by filtration
5. washwashed with water
6. customThe residue was dried under aeration
7. customdried by hot air at 100° C.