تفاعل #1379220

معادلة التفاعل

Methyl 4-hydroxy-2-methoxybenzoate

1-fluoro-3,5-dichloropyridinium trifluoromethanesulfonate

→

methyl 5-fluoro-4-hydroxy-2-methoxybenzoate

المذيبات

dichloromethane

ظروف التفاعل

المعالجة

1. 1
   غسيلThe solution was washed with 5% aqueous citric acid (250 mL)
2. 2
   تجفيفthe organic phase was dried (MgSO4)
3. 3
   ترشيحfiltered
4. 4
   أخرىthe solvent was removed under reduced pressure
5. 5
   أخرىThe residue was purified by pressurized silica gel column chromatography
6. 6
   أخرىCrystallization from ether

الإجراء التجريبي

Methyl 4-hydroxy-2-methoxybenzoate (10 g, 55 mmol) from step 3 above and 1-fluoro-3,5-dichloropyridinium trifluoromethanesulfonate (21 g, 66 mmol) were refluxed in dichloromethane (250 mL) for 48 h. The solution was washed with 5% aqueous citric acid (250 mL) and the organic phase was dried (MgSO4), filtered, and the solvent was removed under reduced pressure. The residue was purified by pressurized silica gel column chromatography using 99:1 CH2Cl2 :MeOH as eluant. Crystallization from ether gave methyl 5-fluoro-4-hydroxy-2-methoxybenzoate.

المصدر