反应详情

温度

60 °C

To a stirred solution of this compound (10.25 g) in toluene (125 mL), warmed in an oil bath at 60° C. was added silver carbonate (16.6 g), then methyl iodide (8.52 g). The resulting mixture was stirred and heated for 3 hours at 60° C. After cooling, the mixture was filtered through Celite® and the solvent evaporated to give a yellow oil. Silica gel chromatography (4:1 hexane/acetone) gave a nearly colorless oil, whose 1H-NMR and MS data were consistent with methyl 3-benzyloxy-6-methoxypicolinate. Hydrolysis of this ester to the title acid 18 was accomplished with LiOH.H2O as described above for related esters.

1. temperatureAfter cooling
2. filtrationthe mixture was filtered through Celite®
3. customthe solvent evaporated
4. customto give a yellow oil