反应详情

5-Bromo-6-chloropyridine-3-sulfonyl chloride (8.2 g) in methanol (20 mL) was cooled to 0° C. To this solution was added 7N NH3 in methanol (80 mL). The reaction mixture was stirred over night at room temperature. The solvent was removed at low temperature, and the residue was partitioned between ethyl acetate and water. The aqueous layer was extracted with ethyl acetate three times. The combined organic layers were washed with brine, dried (MgSO4), filtered, and concentrated. The solid was purified by flash column chromatography on silica gel to afford 4.2 g of the clean product.

1. customThe solvent was removed at low temperature
2. customthe residue was partitioned between ethyl acetate and water
3. extractionThe aqueous layer was extracted with ethyl acetate three times
4. washThe combined organic layers were washed with brine
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated
8. customThe solid was purified by flash column chromatography on silica gel