تفاعل #465959

معادلة التفاعل

methyl 4-amino-6-bromo-3-chloropyridine-2-carboxylate

NaOH

→

4-amino-6-bromo-3-chloropyridine-2-carboxylic acid

المردود 34.8%

المذيبات

methanol

ظروف التفاعل

المعالجة

1. 1
   أخرىevaporated to dryness in vacuo
2. 2
   workup.DISSOLUTIONThe residue was dissolved in water
3. 3
   أخرىAfter separation of the phases
4. 4
   أخرىThe aqueous layer was evaporated to dryness
5. 5
   workup.DISSOLUTIONthe residue was dissolved in 50 mL of methanol
6. 6
   ترشيحfiltered
7. 7
   أخرىThe filtrate was evaporated under reduced pressure
8. 8
   أخرىthe residue was triturated with 5 percent diethyl ether in petroleum ether

الإجراء التجريبي

To methyl 4-amino-6-bromo-3-chloropyridine-2-carboxylate (200mg; 0.8 mmol) in 10 mL of methanol was added excess 2N NaOH (10 mL). The mixture was stirred for 1 hr at ambient temperature and then evaporated to dryness in vacuo. The residue was dissolved in water and diethyl ether. After separation of the phases, the aqueous layer was acidified with 1N HCl to a pH=2. The aqueous layer was evaporated to dryness and the residue was dissolved in 50 mL of methanol and filtered. The filtrate was evaporated under reduced pressure and the residue was triturated with 5 percent diethyl ether in petroleum ether to give 70 mg of 4-amino-6-bromo-3-chloropyridine-2-carboxylic acid, mp 182-183° C.

المصدر