4-Bromophenol → 1-Bromo-4-(2,2,2-trifluoroethoxy)benzene

Temperatur

120 °C

To a stirred solution of trifluoroethyl tosylate (1.5 g, 5.8 mmol) in DMF (20 mL) was added K2CO3 (4 g, 29.4 mmol) followed by addition of p-bromo phenol (1.1 g, 6.46 mmol) at RT under inert atmosphere. The reaction mixture was stirred at 120° C. for 6 h. The volatiles were evaporated under reduced pressure; the residue was diluted with water (5 mL) and extracted with ethyl acetate (3×30 mL). The organic layer was washed with water, brine and dried over anhydrous Na2SO4, filtered and concentrated in vacuo. The crude compound was purified by silica gel column chromatography eluting with 5% EtOAc/hexane to afford the desired product (0.8 g, 3.13 mmol, 53.3%) as semi solid. 1H NMR (200 MHz, CDCl3): □ 7.44-7.38 (m, 2H), 6.86-6.80 (m, 2H), 4.38-4.25 (m, 2H).

1. customThe volatiles were evaporated under reduced pressure
2. additionthe residue was diluted with water (5 mL)
3. extractionextracted with ethyl acetate (3×30 mL)
4. washThe organic layer was washed with water, brine
5. dry with materialdried over anhydrous Na2SO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe crude compound was purified by silica gel column chromatography
9. washeluting with 5% EtOAc/hexane

ORD-Eintrag

ord-260b662328784621993316d06e5aabb8

Quelldatensatz

uspto-grants-2012_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08236962B2