反应 #1954

反应方程式

4-Chloro-5-fluoro-2-picoline-N-oxide

potassium carbonate

→

title compound

收率 142.1%

4-Chloro-5-fluoro-2-picoline

收率 142.1%

溶剂

acetic acid

反应条件

后处理

1. 1
   其他equiped with a mechanical stirrer, a condenser
2. 2
   温度the reaction mixture was carefully heated to 35°-40° C
3. 3
   其他an exothermic reaction
4. 4
   其他to rise to 120° C.
5. 5
   其他The flask was transferred to a cold water bath
6. 6
   workup.ADDITIONThe reaction mixture was then poured over ice
7. 7
   workup.DISTILLATIONdistilled
8. 8
   workup.DISTILLATIONThe aqueous distillate collected at 92°-96° C.
9. 9
   萃取was extracted with three portions of methylene chloride
10. 10
    萃取The combined organic extract
11. 11
    干燥was dried over anhydrous sodium sulfate
12. 12
    过滤filtered
13. 13
    workup.DISTILLATIONdistilled

实验过程

4-Chloro-5-fluoro-2-picoline-N-oxide (12.43 g, 76.93 mmol), from Step 7, was dissolved in 52 mL of glacial acetic acid in a 3-necked flask equiped with a mechanical stirrer, a condenser and a thermometer. Iron powder (6.45 g, 115.5 mmol) was added to the solution at ambient temperature and the reaction mixture was carefully heated to 35°-40° C. After 10 min at 30° C., an exothermic reaction took place which caused the reaction temperature to rise to 120° C. and the reaction mixture became a very dark brown-colored solution. The flask was transferred to a cold water bath and the temperature of the solution brought down to ambient. The reaction mixture was then poured over ice. The resultant aqueous mixture was adjusted to pH 9 with potassium carbonate and steam distilled. The aqueous distillate collected at 92°-96° C. was extracted with three portions of methylene chloride. The combined organic extract was dried over anhydrous sodium sulfate, filtered and distilled to afford 15.91 g (71% yield) of the title compound, b.p. 138°-140° C.; MS GC-MS M/Z: 146 (M+H)+ ; 1H NMR (CDCl3) d 2.53 (s, 3H), 7.23 (d, 1H, J=6.0 Hz), 8.37 (s, 1H).

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