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Potassium carbonate (6.1 g, 43.9 mmol) and methyl iodide (21 mL, 338 mmol) were added sequentially to a solution comprising 6-cyanopyridine-3-carboxylic acid (5 g, 33.8 mmol) in acetone (300 mL). The mixture was heated at reflux for 15 hours and concentrated under reduced pressure. The residue was partioned between ether and saturated sodium bicarbonate. The organic layer was washed with water, dried (MgSO4), filtered and concentrated under reduced pressure to provide methyl 6-cyanopyridine-3-carboxylate (4.4 g, 27.1 mmol) as a tan solid. 1H-NMR (300 Mhz, DMSO-d6): 3.9 (s, 3H), 8.2 (d, 1H, J=7.5 Hz), 8.5 (d, 1H, J=7.5 Hz), 9.2 (s, 1H).

1. temperatureThe mixture was heated
2. temperatureat reflux for 15 hours
3. concentrationconcentrated under reduced pressure
4. washThe organic layer was washed with water
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure