Sodium Hydroxide → 6-Bromo-2-fluoropyridin-3-amine

Temperatur

2.5 °C

To a stirred solution of 2-fluoro-pyridin-3-ylamine (3.0 g, 26.79 mmol) in acetic acid (24 mL), sodium acetate (2.17 g, 26.46 mmol) was added. The reaction mixture was cooled to 0-5° C. and a solution of bromine (1.37 mL, 26.74 mmol) in acetic acid (8 ml) was added dropwise. After 1 hour the reaction mixture was cooled to 0° C., 10% aqueous sodium hydroxide solution was added to adjust the pH ˜5 and the product was extracted with ethyl acetate (200 mL). The organic layer was washed with water, brine, dried over magnesium sulfate and concentrated under reduced pressure. The crude product was purified by flash column chromatography using 20% ethyl acetate in hexane to afford 6-bromo-2-fluoro-pyridin-3-ylamine (3.9 g) as a brown solid. 1H NMR (400 MHz, CDCl3) δ: 7.15 (d, J=7.8 Hz, 1H), 7.00 (dd, J=10.1, 7.8 Hz, 1H), 3.80 (s, 2H). ESMS: m/z 191.32, 193.34 [M+1]+

1. temperatureAfter 1 hour the reaction mixture was cooled to 0° C.
2. extractionthe product was extracted with ethyl acetate (200 mL)
3. washThe organic layer was washed with water, brine
4. dry with materialdried over magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe crude product was purified by flash column chromatography

ORD-Eintrag

ord-e2573721d9c84b99ae6eb75f52c4ce69

Quelldatensatz

uspto-grants-2010_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07772256B2