反应详情

A mixture of tert-butyl 2-[(3-amino-5,6-dimethyl-2-phenoxypyridin-4-yl)amino]ethylcarbamate (43.7 g, 117 mmol), triethyl orthoacetate (22.6 mL, 123 mmol), pyridine hydrochloride (4.4 g) and toluene (440 mL) was heated at reflux for 30 minutes. The reaction mixture was concentrated under reduced pressure to provide a brown oil. The oil was dissolved in ethyl acetate (1 L) and washed with water (2×500 mL). The aqueous washes were combined and extracted with ethyl acetate (2×500 mL). The combined organics were washed with brine, dried over magnesium sulfate and then concentrated under reduced pressure to provide 46.4 g of tert-butyl 2-(2,6,7-trimethyl-4-phenoxy-1H-imidazo[4,5-c]pyridin-1-yl)ethylcarbamate as a white solid, m.p. 180–182° C.

1. temperaturewas heated
2. temperatureat reflux for 30 minutes
3. concentrationThe reaction mixture was concentrated under reduced pressure
4. customto provide a brown oil
5. washwashed with water (2×500 mL)
6. extractionextracted with ethyl acetate (2×500 mL)
7. washThe combined organics were washed with brine
8. dry with materialdried over magnesium sulfate
9. concentrationconcentrated under reduced pressure