反应详情

Thionyl chloride (10 mL) was added to nicotinic acid (370 mg, 3 mmol) and the mixture was stirred at reflux for 6 hr. Thionyl chloride was evaporated under reduced pressure and the residues was dried in vacuum to obtain nicotinoyl chloride. 3-Hydroxyanthranilic acid (153 mg, 1.0 mmol) and pyridine (240 mg, 3.0 mmol) were added to toluene (10 mL) and the mixture was stirred at room temperature for 30 min. Then nicotinoyl chloride (420 mg, 3.0 mmol) was added. The mixture was stirred at room temperature for 30 min and then at 80° C. for 2 hr. The resulting mixture was extracted with ethyl acetate (100 mL×4) and concentrated. The crude product was purified by column chromatography (silica gel, petroleum ether:ethyl acetate 20: to 5:1) to get 3-hydroxy-2-(nicotinamido)benzoic acid as a solid (210 mg, yield 81%). LC-MS (ESI) m/z 259 [M+1]+.

1. stirringThe mixture was stirred at room temperature for 30 min
2. waitat 80° C. for 2 hr
3. extractionThe resulting mixture was extracted with ethyl acetate (100 mL×4)
4. concentrationconcentrated
5. customThe crude product was purified by column chromatography (silica gel, petroleum ether:ethyl acetate 20: to 5:1)