反应详情

A solution of tert-butyl N′-(3-amino-7-bromoquinolin-4-yl)hydrazinecarboxylate (37.1 g, 105 mmol) in 315 mL of toluene was treated with trimethyl orthobutyrate (16.7 mL, 105 mmol) and pyridine hydrochloride (0.12 g, 1.05 mmol). The reaction mixture was heated to reflux under an atmosphere of nitrogen. After 4 h, the reaction mixture was cooled to ambient temperature and concentrated under reduced pressure to give a brown oil. The oil was dissolved in 300 mL of CHCl3. The solution was washed with 5% Na2CO3 (100 mL), water (100 mL) and brine (100 mL). The organic portion was dried over Na2SO4, filtered and concentrated under reduced pressure to yield a brown foam. The foam was purified by chromatography (SiO2, 100:0 gradient to 95:5 CHCl3:MeOH) to yield 30.1 g of tert-butyl (7-bromo-2-propyl-1H-imidazo[4,5-c]quinolin-1-yl)carbamate as a light brown solid.

1. temperatureThe reaction mixture was heated
2. temperatureto reflux under an atmosphere of nitrogen
3. concentrationconcentrated under reduced pressure
4. customto give a brown oil
5. washThe solution was washed with 5% Na2CO3 (100 mL), water (100 mL) and brine (100 mL)
6. dry with materialThe organic portion was dried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customto yield a brown foam
10. customThe foam was purified by chromatography (SiO2, 100:0 gradient to 95:5 CHCl3:MeOH)