Réaction #1955

Équation de réaction

water

4-chloro-5-fluoro-2-picoline

product

4-Chloro-5-fluoro-2-picoline

t-butylhypochlorite

→

title compound

3,4-Dichloro-5-fluoro-2-picoline

Solvants

chloroform

Conditions de réaction

Traitement

1. 1
   Extractionthe resultant aqueous mixture is extracted with methylene chloride
2. 2
   SéchageThe organic solution is dried over anhydrous magnesium sulfate
3. 3
   Filtrationfiltered
4. 4
   Concentrationconcentrated under reduced pressure
5. 5
   workup.DISTILLATIONdistilled

Mode opératoire

To 0.87 g (6 mmol) of 4-chloro-5-fluoro-2-picoline, the product of Example 66, in 20 mL of chloroform cooled to -45° C., is added 0.75 mL of t-butylhypochlorite. The reaction mixture is stirred at -45° C. for 2 hours and at 0° C. for 2 hours. The reaction mixture is then poured into water and the resultant aqueous mixture is extracted with methylene chloride. The organic solution is dried over anhydrous magnesium sulfate, filtered, concentrated under reduced pressure and distilled to afford the title compound.

Source