反应详情

温度

-40 °C

To a round bottom flask, 2,6-difluoro-nicotinic acid methyl ester (52, 2.00 g, 11.6 mmol) is combined with 20.0 mL of N,N-dimethylformamide under an atmosphere of nitrogen at −40° C. To this, 5-amino-2-methoxypyridine (53, 1.55 g, 12.5 mmol) and triethylamine (5.0 mL, 36.0 mmol) are added and the reaction stirred at −40° C., then warmed to room temperature and reacted overnight. The reaction is then heated to 50° C. over the weekend, then at 70° C. for 3 hours. The reaction is poured into water and extracted with ethyl acetate. The organic layer is dried over sodium sulfate, filtered and the filtrate concentrated under vacuum. The resulting material is purified by silica gel column chromatography eluting with 20-100% ethyl acetate in hexane. Appropriate fractions are combined and concentrated under vacuum to provide the desired compound (54, 1.20 g).

1. temperaturewarmed to room temperature
2. customreacted overnight
3. temperatureThe reaction is then heated to 50° C. over the weekend
4. extractionextracted with ethyl acetate
5. dry with materialThe organic layer is dried over sodium sulfate
6. filtrationfiltered
7. concentrationthe filtrate concentrated under vacuum
8. customThe resulting material is purified by silica gel column chromatography
9. washeluting with 20-100% ethyl acetate in hexane
10. concentrationconcentrated under vacuum