Pyridine → 1-Bromo-4-[4-(trifluoromethoxy)phenoxy]benzene

Participants

Reaction Steps

To a solution of 4-(trifluoromethoxy)phenylboronic acid (10.0 g, 48.6 mmol) and 4-bromophenol (4.20 g, 24.3 mmol) in dichloromethane (250 ml) over 4 A molecular sieves was added copper (II) acetate (4.41 g, 24.3 mmol), diisopropylethylamine (21 ml, 121 mmol) and pyridine (10 ml, 121 mmol). The reaction mixture was stirred 12 hours at room temperature under positive pressure of dry air and concentrated in vacuo. The resulting residue was resuspended in ethyl acetate and 0.5 M HCl. The organic layer was extracted with water and brine, dried over magnesium sulfate and concentrated in vacuo. Purification by silica gel chromatography (ethyl acetate/hexanes) provided 5.07 g 1-bromo-4-(4-(trifluoromethoxy) phenoxy) benzene (63% yield) as a clear oil. 1H NMR (400 MHz, CDCl3) δ 7.45 (d, J=9.3 Hz, 1H), 7.19 (d, J=8.9 Hz, 1H), 6.99 (d, J=9.3 Hz, 1H), 6.89 (d, J=8.9 Hz, 1H).

Provenance & Evidence