反应详情

Phosphorous pentachloride (0.136 g, 0.65 mmol) was added to a solution of 6,7-dichloro-2,3-dimethoxy-5-(N-methylcarbamoyl)quinoxaline (Preparation 7, 0.197 g, 0.62 mmol) in toluene (7 mL) and the mixture was heated under reflux under nitrogen for 1 hour. The reaction was cooled to room temperature and trimethylsilyl azide (123 μL, 0.107 g, 0.93 mmol) was added. After stirring at room temperature for 18 hours, dilute aqueous ammonia solution (20 mL) was added and the mixture was extracted with dichloromethane (3×50 mL). The combined organic extracts were dried (MgSO4) and evaporated under reduced pressure. The residue was purified by flash chromatography on silica gel, eluting with dichloromethane to give the title compound (0.080 g, 38%) as a white solid.

1. temperaturethe mixture was heated
2. temperatureunder reflux under nitrogen for 1 hour
3. extractionthe mixture was extracted with dichloromethane (3×50 mL)
4. dry with materialThe combined organic extracts were dried (MgSO4)
5. customevaporated under reduced pressure
6. customThe residue was purified by flash chromatography on silica gel
7. washeluting with dichloromethane