反应详情

To a suspension of sodium hydride (5.31 g, 133 mmol) in 1,4-dioxane (250 ml), ethyl glycolate (12.56 ml, 133 mmol) was added drop wise over a period of 30 minutes ensuring that the temperature was maintained below 30° C. The resulting thick suspension was stirred at room temperature for 15 minutes. In a separate 11 round-bottomed flask was added 5-bromo-2-chloro-3-nitropyridine (21 g, 88 mmol) in 1,4-dioxane (150 ml) to give a brown solution. The suspension of sodium hydride and ethyl glycolate was added drop wise over a period of 30 minutes at 0° C. The resulting reaction mixture was heated to 80° C. overnight.

1. additionwas added drop wise over a period of 30 minutes
2. temperaturewas maintained below 30° C
3. customIn a separate 11 round-bottomed flask
4. customto give a brown solution
5. additionwas added drop wise over a period of 30 minutes at 0° C
6. customThe resulting reaction mixture
7. temperaturewas heated to 80° C. overnight