Reaktion #43406

Reaktionsgleichung

hydrochloric acid

2,6-dichloro-5-fluoro-3-pyridinecarboxylic acid

sodium methoxide

water

→

product

Ausbeute 65.0%

2-Chloro-5-fluoro-6-(methyloxy)-3-pyridinecarboxylic acid

Ausbeute 65.0%

Lösungsmittel

methanol

methanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe mixture heated
2. 2
   Temperaturto reflux for 4 hours
3. 3
   Einengenthen concentrated to ca 400 ml
4. 4
   FiltrationFiltration
5. 5
   Waschenwashing with water
6. 6
   Trocknendrying in vacuo over P2O5 for 18 h

Vorschrift

A solution of 2,6-dichloro-5-fluoro-3-pyridinecarboxylic acid (51.12 g, 243 mmol) in methanol (400 ml) was treated with sodium methoxide in methanol (25% w/v, 100 ml, 535 mmol) and the mixture heated to reflux for 4 hours. The cooled mixture was treated with water (400 ml) and acidified to pH2 with aqueous hydrochloric acid (2M) then concentrated to ca 400 ml. Filtration, washing with water and drying in vacuo over P2O5 for 18 h afforded the product as a white solid (32.65 g, 65%).

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