反应详情

6-chloropicolinic acid (51.2 g, 0.325 mol) in thionyl chloride (90 ml) was stirred and heated to reflux for 2 hours. The excess thionyl chloride was evaporated in vacuo and diethylether (250 ml) added to the residual 6-chloropicolinoyl chloride. A solution of 4-fluoroaniline (37.5 g, 0.338 mol) in diethylether (100 ml) was added with stirring, maintaining the temperature below 20° C. After the addition, the reaction mixture was stirred overnight at ambient temperature. Water was added to the reaction mixture and the organic layer separated. After a further washing with water and drying with anhydrous magnesium sulphate, the solvent was removed in vacuo to give the title compound as a pale brown solid (66 g, 82%), mp 98° C.

1. temperatureheated
2. temperatureto reflux for 2 hours
3. customThe excess thionyl chloride was evaporated in vacuo and diethylether (250 ml)
4. additionadded to the residual 6-chloropicolinoyl chloride
5. temperaturemaintaining the temperature below 20° C
6. additionAfter the addition
7. stirringthe reaction mixture was stirred overnight at ambient temperature
8. customthe organic layer separated
9. washAfter a further washing with water
10. dry with materialdrying with anhydrous magnesium sulphate
11. customthe solvent was removed in vacuo