Methanol → 3-Amino-6-chloropyridine-2-carbonitrile

To a solution of 2,6-dichloro-3-nitropyridine (4.8 g, 26.15 mmol) in MeOH (60 mL) and concentrated HCl (25 mL) was slowly added iron powder (5.12 g, 91.53 mmol). After the completion of addition, the mixture was refluxed for 45 minutes and poured into 700 mL of H2O. Filtration of the resulting slurry gave a dull yellow solid. The filtrate was made basic with concentrated NH4OH, the resulting slurry was filtered and both the solid and the filtrates were extracted with ether. The combined extracts were dried (MgSO4) and evaporated to give the title compound as a creamy solid (2.8 g, 58%): mp 162-165° C. which was used in next step without further purification.

1. additionAfter the completion of addition
2. temperaturethe mixture was refluxed for 45 minutes
3. filtrationFiltration of the resulting slurry
4. customgave a dull yellow solid
5. filtrationthe resulting slurry was filtered
6. extractionboth the solid and the filtrates were extracted with ether
7. dry with materialThe combined extracts were dried (MgSO4)
8. customevaporated

ORD record

ord-9d346816e0a946028716a29e084b0c54

Source dataset

uspto-grants-2002_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06399593B1