Bromine → 6-Bromo-2-nitropyridin-3-amine

Temperatur

0 °C

To a stirred suspension of 2-nitro-pyridin-3-ylamine (5.06 g, 36.40 mmol) and sodium acetate (2.99 g, 36.46 mmol) in acetic acid (40 mL), a solution of bromine (2.5 mL, 48.79 mmol) in acetic acid (8 ml) was added drop-wise and the reaction mixture was stirred overnight. The acetic acid was removed under reduced pressure. The residue was cooled to 0° C., neutralized with saturated sodium bicarbonate solution to adjust the pH to ˜7, and extracted with ethyl acetate (4×50 mL). The combined organic extracts were washed with brine, dried over anhydrous Na2SO4, and concentrated under reduced pressure. The residue was triturated with ethyl acetate to afford compound (5) (5.1 g) as a yellow solid.

1. customThe acetic acid was removed under reduced pressure
2. extractionextracted with ethyl acetate (4×50 mL)
3. washThe combined organic extracts were washed with brine
4. dry with materialdried over anhydrous Na2SO4
5. concentrationconcentrated under reduced pressure
6. customThe residue was triturated with ethyl acetate

ORD-Eintrag

ord-4aaebdaa260f4ef1b0fe443fb0b06310

Quelldatensatz

uspto-grants-2012_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08193363B2