反应详情

2-Ethyl-5,7-dimethyl-3H-imidazo[4,5-b]pyridine (U.S. Pat. No. 5,424,432) (3.50 g, 20.0 mmol) was dissolved in DMF (67 mL), and lithium hydroxide monohydrate (1.26 g, 30.0 mmol) was added thereto, followed by stirring at room temperature for 20 minutes. Then, p-nitorobenzylbromide (4.31 g, 20.0 mmol) was slowly added and stirred at room temperature for 30 minutes. Water (130 mL) was added to the reaction mixture and the precipitated crystals were collected by filtration, followed by washing with water. The crystals was dried under reduced pressure to obtain 2-ethyl-5,7-dimethyl-3-(4-nitrobenzyl)-3H-imidazo[4,5-b]pyridine (4.91 g, 15.8 mmol, yield 79.1%).

1. additionThen, p-nitorobenzylbromide (4.31 g, 20.0 mmol) was slowly added
2. stirringstirred at room temperature for 30 minutes
3. filtrationthe precipitated crystals were collected by filtration
4. washby washing with water
5. customThe crystals was dried under reduced pressure