反应详情

A solution of 2,6-dimethylpyridin-4-ylamine (2.00 g, 16.4 mmol) in 5 mL of acetic acid was treated dropwise with a solution of bromine (0.84 mL, 16.3 mmol) in 2 mL of acetic acid at room temperature in a water bath over a period of 10 minutes. After I hour, the resulting slurry was treated with 40 mL of 20% sodium hydroxide solution and extracted with three 100 mL portions of dichloromethane (CH2Cl2). The combined extracts were dried over magnesium sulfate, filtered, and concentrated in vacuo. The resulting solid (starting material-desired product-dibromo byproduct (1:3:1)) was dissolved in 100 mL of hot hexanes and hot filtered to remove the insoluble starting material. The filtrate was allowed to cool to room temperature, which gave the title product as fine white needles (1.30 g, 40% yield).

1. extractionextracted with three 100 mL portions of dichloromethane (CH2Cl2)
2. dry with materialThe combined extracts were dried over magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated in vacuo
5. dissolutionThe resulting solid (starting material-desired product-dibromo byproduct (1:3:1)) was dissolved in 100 mL of hot hexanes
6. filtrationhot filtered
7. customto remove the