反应详情

温度

0 °C

5-Chloro-2,4-difluorobenzenesulfonyl chloride (1 g, 4 mmol) in dichloromethane (7.6 mL) was added portion-wise to a solution of 2-amino-5-fluoropyridine (498 mg, 4.44 mmol) in pyridine (7.6 mL, 94 mmol) cooled to 0° C. After addition was complete, the reaction mixture was warmed to room temperature. After 16 hours, the reaction mixture was diluted with dichloromethane and hydrochloric acid (1 N aqueous solution). The aqueous layer was extracted with dichloromethane. The combined organic layers were washed with water, diluted with ethyl acetate, dried over sodium sulfate, filtered and concentrated in vacuo. The residue was dissolved in dichloromethane (8.0 mL) and N,N-diisopropylethylamine (0.776 mL, 4.45 mmol) added. The mixture was cooled to 0° C. and chloromethyl methyl ether (0.338 mL, 4.45 mmol) was added dropwise by syringe. The reaction mixture was warmed to room temperature and after stirring for 6 hours, the reaction mixture was diluted with dichloromethane and washed with saturated aqueous sodium bicarbonate solution. The organic layer was dried over sodium sulfate, filtered and concentrated in vacuo onto Celite™. The residue was purified by automated flash chromatography (24 g silica gel column) eluting with ethyl acetate:hexanes (gradient 0:1 to 1:0, by volume) to afford the title compound, 363 mg.

1. additionAfter addition
2. temperaturethe reaction mixture was warmed to room temperature
3. extractionThe aqueous layer was extracted with dichloromethane
4. washThe combined organic layers were washed with water
5. additiondiluted with ethyl acetate
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. dissolutionThe residue was dissolved in dichloromethane (8.0 mL)
10. temperatureThe mixture was cooled to 0° C.
11. temperatureThe reaction mixture was warmed to room temperature
12. washwashed with saturated aqueous sodium bicarbonate solution
13. dry with materialThe organic layer was dried over sodium sulfate
14. filtrationfiltered
15. concentrationconcentrated in vacuo onto Celite™
16. customThe residue was purified by automated flash chromatography (24 g silica gel column)
17. washeluting with ethyl acetate