反应详情

Ethyl 3-[(3-aminoquinolin-4-yl)amino]-2,2-dimethylpropanoate (8.2 g, 29 mmol) was treated according to a modification of the method described in Part B of Example 8. Prior to the addition of trimethyl orthobutyrate (5.3 g, 36 mmol) and pyridinium p-toluenesulfonate (0.10 g, 0.40 mmol), the reaction was heated at reflux for ten minutes. During the work-up procedure, the solution was dried over potassium carbonate. The crude product was purified by column chromatography on silica gel (eluting with 93:7 dichloromethane:methanol containing 3 mL concentrated ammonium hydroxide per liter of eluent) to provide 2.1 g of ethyl 2,2-dimethyl-3-(2-propyl-1H-imidazo[4,5-c]quinolin-1-yl)propanoate as an orange oil.

1. temperaturethe reaction was heated
2. temperatureat reflux for ten minutes
3. dry with materialDuring the work-up procedure, the solution was dried over potassium carbonate
4. customThe crude product was purified by column chromatography on silica gel (eluting with 93:7 dichloromethane:methanol containing 3 mL concentrated ammonium hydroxide per liter of eluent)