反应详情

A mixture of 6-methoxy-[1,5]naphthyridine-3-carboxylic acid ethyl ester (32.0 g, 74.45 mmol, 1.0 eq) and sodium hydroxide (10.12 g, 137.51 mmol, 1.85 eq) in ethanol (110 mL) is refluxed for 3 hours. The solvent is evaporated and the residue is dissolved in water, washed with ethyl acetate, then acidified with 3N hydrochloric acid aqueous solution to pH=3-4. The precipitate is collected by filtration, dried under 50° C. overnight to afford 6-methoxy-[1,5]naphthyridine-3-carboxylic acid as a white solid (24.5 g, 82% yield).

1. temperatureis refluxed for 3 hours
2. customThe solvent is evaporated
3. dissolutionthe residue is dissolved in water
4. washwashed with ethyl acetate
5. filtrationThe precipitate is collected by filtration
6. customdried under 50° C. overnight