Réaction #302869

Équation de réaction

Methanol

thionyl chloride

2-aminonicotinic acid

→

2-aminonicotinic acid methyl ester

Rendement 55.0%

Conditions de réaction

Traitement

1. 1
   TempératureThe mixture was heated
2. 2
   Températureto reflux
3. 3
   Températurethe mixture was refluxed for 19 hours
4. 4
   AutreThe solvent was removed under reduced pressure
5. 5
   workup.ADDITIONThe residue was carefully treated with a satured NaHCO3 solution
6. 6
   Extractionextracted with ethyl acetate
7. 7
   SéchageThe organic fraction was dried over magnesium sulfate
8. 8
   Autrethe solvent was evaporated under reduced pressure

Mode opératoire

42.4 g (356.4 mmol, 26 ml) thionyl chloride was added dropwise to a suspension of 15.0 g (108.6 mmol) 2-aminonicotinic acid in 150 ml abs. Methanol, while cooling. The mixture was heated to reflux and the mixture was refluxed for 19 hours. The evolving SO2 was scrubbed. The solvent was removed under reduced pressure after cooling down to room temperature. The residue was carefully treated with a satured NaHCO3 solution and extracted with ethyl acetate. The organic fraction was dried over magnesium sulfate and the solvent was evaporated under reduced pressure. 9.13 g (55%) of 2-aminonicotinic acid methyl ester was isolated as a pale yellow solid (m.p. 83° C.).

Source