Hydrogen Bromide → 2,5-Dibromo-4-propylpyridine

Temperatur

-10 °C

5-Bromo-4-propylpyridine-2-amine (5.67 g, 26.3 mmol) was added 48% hydrogen bromide (21 mL) at 10° C. The mixture was added bromine (4.0 mL) under ice-cold conditions, and added dropwise with an aqueous solution (4.5 mL) of sodium nitrite (4.54 g) at −10° C. The mixture was stirred at −10° C. for 0.5 hours, then added 1N aqueous solution of sodium hydroxide (10 mL), and stirred at room temperature for 2 hours. The reaction solution was added water, extracted with diethylether. The organic layer was washed with brine, dried over anhydrous sodium sulfate, and concentrated in vacuo. The obtained residue was purified by silica-gel column chromatography (diethylether), and the title compound (6.96 g (yield 95%)) was obtained as a brown oil.

1. stirringstirred at room temperature for 2 hours
2. extractionextracted with diethylether
3. washThe organic layer was washed with brine
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated in vacuo
6. customThe obtained residue was purified by silica-gel column chromatography (diethylether)

ORD-Eintrag

ord-7732ee161c1c418896b0526ffca541db

Quelldatensatz

uspto-grants-2013_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08551985B2