Ammonia → Methyl 2-amino-5-chloronicotinate

Beteiligte Stoffe

Reaktionsschritte

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-methanol (˜500 mL), followed by adsorption onto silica gel (25 g) and then purification by flash column chromatography (25:10:1 hexanes-dichloromethane-ether), gave methyl 2-amino-5-chloronicotinate (6.08 g, 75% yield).

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