反応 #302869

反応方程式

Methanol

thionyl chloride

2-aminonicotinic acid

→

2-aminonicotinic acid methyl ester

収率 55.0%

反応条件

後処理

1. 1
   温度The mixture was heated
2. 2
   温度to reflux
3. 3
   温度the mixture was refluxed for 19 hours
4. 4
   その他The solvent was removed under reduced pressure
5. 5
   workup.ADDITIONThe residue was carefully treated with a satured NaHCO3 solution
6. 6
   抽出extracted with ethyl acetate
7. 7
   乾燥The organic fraction was dried over magnesium sulfate
8. 8
   その他the solvent was evaporated under reduced pressure

実験手順

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.).

出典