تفاعل #43406

معادلة التفاعل

hydrochloric acid

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

sodium methoxide

water

→

product

المردود 65.0%

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

المردود 65.0%

المذيبات

methanol

methanol

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةthe mixture heated
2. 2
   درجة الحرارةto reflux for 4 hours
3. 3
   تركيزthen concentrated to ca 400 ml
4. 4
   ترشيحFiltration
5. 5
   غسيلwashing with water
6. 6
   تجفيفdrying in vacuo over P2O5 for 18 h

الإجراء التجريبي

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%).

المصدر