Hydrochloric Acid → 3-Bromo-2-methoxypyridin-4-amine

Temperature

0 °C

Methanol (350 mL) was charged in a two-neck round bottom flask equipped with a guard tube and septum and cooled to 0° C. Sodium metal (23 g) was added to it slowly in pieces. After all sodium metal had dissolved, 4-amino-3-bromo-2-chloro pyridine (23 g, 178 mmol) was added and the solution was heated at 180° C. in a pressure vessel for 5-6 h. The reaction mixture was then cooled to 0° C. and adjusted to pH 8 by addition of conc. HCl. Solvent was removed under reduced pressure and the residue was suspended in ethyl acetate. Undissolved impurities were removed by filtration and the filtrate was concentrated under reduced pressure to obtain pure product.

1. customequipped with a guard tube
2. temperaturethe solution was heated at 180° C. in a pressure vessel for 5-6 h
3. temperatureThe reaction mixture was then cooled to 0° C.
4. customSolvent was removed under reduced pressure
5. customwere removed by filtration
6. concentrationthe filtrate was concentrated under reduced pressure
7. customto obtain pure product

ORD record

ord-0adb654795fa4864b1e4c80fb0add3f2

Source dataset

uspto-grants-2012_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08198448B2