Ammonia → Methyl 2-amino-5-chloronicotinate

HRID 221419

Reaktionsgleichung

Reaktionsgleichung von HRID 221419
Cl[C:2]1[N:11]=[CH:10][C:9]([Cl:12])=[CH:8][C:3]=1[C:4]([O:6][CH3:7])=[O:5].[NH3:13]>CC(C)=O.CO>[NH2:13][C:2]1[N:11]=[CH:10][C:9]([Cl:12])=[CH:8][C:3]=1[C:4]([O:6][CH3:7])=[O:5]

Komponenten

4

Edukt 2

HCID 222AmmoniaHCID 2764318Methyl 2,5-Dichloronicotinate

Produkt 1

HCID 15828199Methyl 2-amino-5-chloronicotinateAusbeute 148,1 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 21894497Aceton-methanolLösungsmittel

Versuchsvorschrift

Performed in duplicate on identical scales in two pressure vessels, methyl 2,5-dichloronicotinate (4.5 g, 22 mmol) was dissolved in ammonia solution (250 mL, 0.5 M in 1,4-dioxane; 0.125 mol). The pressure vessels were sealed and heated at (85±5)° C. for 9 days. The two reaction mixtures were allowed to cool to room temperature, then combined and concentrated under reduced pressure to yield a white solid. Dissolution of the solid in 1:1 acetone-MeOH (˜500 mL), followed by adsorption onto silica gel (25 g) and then purification by flash column chromatography (25:10:1 hexane-CH2Cl2-Et2O), gave 6.08 g (75%) of methyl 2-amino-5-chloronicotinate.

Aufarbeitung

  1. customThe pressure vessels were sealed
  2. temperatureheated at (85±5)° C
  3. customThe two reaction mixtures
  4. concentrationconcentrated under reduced pressure
  5. customto yield a white solid
  6. custompurification by flash column chromatography (25:10:1 hexane-CH2Cl2-Et2O)

Quellen und Nachweise

ORD-Eintrag
ord-557cca1d70e24438a01d5a2bd0dc7e7c
Quelldatensatz
uspto-grants-2012_06
Patentnummer
US08207170B2

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