Water → 2-Bromo-5-fluoro-4-methoxyphenol

Temperature

-15 °C

3-Fluoro-4-methoxy-phenol (21.32 g; 0.15 mol) prepared according to literature [Freedman, J.; Stewart, K. T.; J. Heterocycl. Chem. 1989, 26, 1547-1554] is dissolved in dry dichloromethane (300 mL). The well stirred reaction mixture is cooled to −15° C. (ice/salt). A solution of bromine (23.97 g; 0.15 mol) in dry dichloromethane (75 mL) is dropped into the reaction mixture. After complete addition stirring is continued for one hour. Water (150 mL) containing sodium sulfite (3.0 g) is added to the reaction mixture. Stirring is continued at ambient temperature for 30 min. The organic layer is separated, washed with water (100 mL) and dried over MgSO4 in the presence of decolorizing charcoal. After filtration the solvent is completely removed under reduced pressure. The residue is crystallized from tert-butylmethylether/hexane to yield the title compound as a colorless solid.

1. customreaction mixture
2. additionAfter complete addition
3. stirringstirring
4. additionis added to the reaction mixture
5. stirringStirring
6. waitis continued at ambient temperature for 30 min
7. customThe organic layer is separated
8. washwashed with water (100 mL)
9. dry with materialdried over MgSO4 in the presence of decolorizing charcoal
10. filtrationAfter filtration the solvent
11. customis completely removed under reduced pressure
12. customThe residue is crystallized from tert-butylmethylether/hexane

ORD record

ord-829c1467ca8344e6ac374e24f768565d

Source dataset

uspto-grants-2015_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08927557B2