反应详情

2-(2,4-dichloro-phenyl)-7-hydroxy-1H-benzoimidazole-4-carboxylic acid (1.63 g, 5.03 mmol) obtained in step 3 was dissolved in 30 ml of methanol, and H2SO4 (1.08 ml, 20.12 mmol) was added dropwise thereto and refluxed for 15 hours. The resulting solution was cooled to room temperature, concentrated under a reduced pressure to remove methanol, and the residue was neutralized with NaHCO3. Then, the neutralized residue was extracted with ethyl acetate and concentrated under a reduced pressure to obtain a residue which was purified by recrystallization from ethyl acetate/hexane to obtain the title compound (1.5 g, 3.62 mmol) in a yield of 86%.

1. temperaturerefluxed for 15 hours
2. concentrationconcentrated under a reduced pressure
3. customto remove methanol
4. extractionThen, the neutralized residue was extracted with ethyl acetate
5. concentrationconcentrated under a reduced pressure
6. customto obtain a residue which
7. customwas purified by recrystallization from ethyl acetate/hexane