反应详情

A mixture of 6-chloro-5-hydroxynicotinic acid methyl ester (1.8 g, 9.6 mmol), methyl iodide (2 M solution in Et2O, 5.8 mL, 11.6 mmol) and potassium carbonate (2.0 g, 14.5 mmol) in acetone (190 mL) was refluxed for 6 h. The reaction was then concentrated via rotavap and H2O was added (100 mL). The resulting white precipitate was filtered and rinsed with additional H2O to furnish the product 6-chloro-5-methoxynicotinic acid methyl ester as a white solid (1.33 g, 68%); mp=83-85° C.; 1H NMR (400 MHz, CDCl3) δ 8.60 (d, 1H), 7.77 (d, 1H), 3.98 (s, 3H), 3.96 (s, 3H): GC-MS: Exact mass calcd for C8H8ClNO3 [M]+, 201. Found 201.

1. temperaturewas refluxed for 6 h
2. concentrationThe reaction was then concentrated via rotavap
3. additionH2O was added (100 mL)
4. filtrationThe resulting white precipitate was filtered
5. washrinsed with additional H2O