反应详情

To a suspension of 6-chloropyridine-3-carboxylic acid (4.15 g) in methanol (40 cc), 4 M methanolic sodium methylate solution (40 cc) is added. The mixture is heated under reflux for 60 hours. The solvent is distilled off under reduced pressure (4 kPa). The residue is taken up in distilled water (100 cc) and the mixture is acidified to pH 5 with hydrochloric acid in 11.9 M aqueous solution. The precipitate produced is separated by filtration, washed with distilled water (5×10 cc) and dried in the air. 6-Methoxypyridine-3-carboxylic acid (3.3 g) is produced, m.p. 180° C.

1. additionis added
2. temperatureThe mixture is heated
3. temperatureunder reflux for 60 hours
4. distillationThe solvent is distilled off under reduced pressure (4 kPa)
5. customThe precipitate produced
6. customis separated by filtration
7. washwashed with distilled water (5×10 cc)
8. customdried in the air