反应详情

温度

70 °C

Ethyl 4-chloro-5-ethyl-1H-imidazole-2-carboxylate obtained in Example (1c) (0.52 g, 2.56 mmol) was dissolved in methanol (8 mL) and dichloromethane (2 mL), and the solution was slowly added dropwise to a 3 N aqueous lithium hydroxide solution (3.5 mL, 10.5 mmol) heated to 70° C. Following stirring at that temperature for 40 minutes, the reaction solution was concentrated under reduced pressure and 1 N hydrochloric acid was added dropwise until the pH was 7. Thereafter, purification by reverse phase silica gel column chromatography (elution solvent: distilled water) gave 0.48 g of the title compound as a white solid (100%).

1. concentrationthe reaction solution was concentrated under reduced pressure and 1 N hydrochloric acid
2. additionwas added dropwise until the pH was 7
3. customThereafter, purification
4. washby reverse phase silica gel column chromatography (elution solvent: distilled water)