Hydrogen Bromide → 3-Bromo-2-nitroanisole

Temperatur

0 °C

3-Methoxy-2-nitro-phenylamine (360 mg, 2.14 mmol) was dissolved in HBr (48%, 4.8 mL) at 0° C. A solution of sodium nitrite (0.16 g, 2.40 mmol) in water (360 μL) was added dropwise to the stirred solution over one hour period while the temperature was maintained at 0° C. Then a cold (0° C.) freshly prepared solution of CuBr2 (from CuSO4.5H2O (1.0 g) and HBr (48%, 1.0 mL) mixed 30 min. at room temperature to give a dark purple solution) was added at 0° C. to the reaction mixture. The resulting solution was stirred at 0° C. for 3 hours and at room temperature for 2 days. The reaction mixture was poured onto ice and neutralized carefully with a saturated solution of NaHCO3. The aqueous phase was extracted with AcOEt. The resulting organic phase was washed with brine, dried over MgSO4, filtered and evaporated to yield 482 mg (2.08 mmol, 97%) of 1-bromo-3-methoxy-2-nitrobenzene as an orange solid.

1. customto give a dark purple solution)
2. additionwas added at 0° C. to the reaction mixture
3. extractionThe aqueous phase was extracted with AcOEt
4. washThe resulting organic phase was washed with brine
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. customevaporated

ORD-Eintrag

ord-78931c746203423fb3675771aa70fd5f

Quelldatensatz

uspto-grants-2014_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08674106B2