反应详情

A suspension of 11.58 g (61 mmol) 6-amino-5-bromo-pyridin-2-ol in 200 ml acetone was treated with 10.3 g (184 mmol) KOH pellets and 10 g (80 mmol) dimethylsulfate. The mixture was stirred for 4 h at room temperature and evaporated to dryness. 400 ml water was added and the mixture was extracted four times with 300 ml ethyl acetate. The combined organic phases were dried with MgSO4 and evaporated. The residue was purified by flash column chromatography on silica eluting with hexane/ ethyl acetate 1:1 to yield 3.455 g (28%) of the title compound as orange oil.

1. customevaporated to dryness
2. addition400 ml water was added
3. extractionthe mixture was extracted four times with 300 ml ethyl acetate
4. dry with materialThe combined organic phases were dried with MgSO4
5. customevaporated
6. customThe residue was purified by flash column chromatography on silica eluting with hexane/ ethyl acetate 1:1