Citric Acid → 1,3-Dibromo-5-[3-(trifluoromethyl)phenoxy]benzene

Participants

Reaction Steps

3,5-Dibromophenol (4.1 g; 16.2 mmol), 3-(trifluoromethyl)-phenylboronic acid (6.2 g; 32.4 mmol), Cu(II) acetate (2.9 g; 16.2 mmol), TEA (5.6 mL; 40.5 mmol) and dichloromethane (150 mL) and molecular sieves (2 ml) was added to a reaction flask the reaction mixture was stirred for 7 days. Further 3-(trifluoromethyl)-phenylboronic acid (6.2 g; 32.4 mmol) was added and the reaction mixture stirred for 1 day. Further 3-(trifluoromethyl)-phenylboronic acid (6.2 g; 32.4 mmol) and TEA (5.6 mL; 40.5 mmol) was added and the reaction mixture stirred for 1 day. 5% Aqueous citric acid (150 mL) was added and the two phases were separated. The aqueous phase was extracted with dichloromethane (50 mL×2) and the organic phases were pooled, dried and evaporated to dryness. The crude product purified by flash chromatography (heptane→ethyl acetate:heptane 1:9). Yield: 1.86 g; HPLC-MS: m/z: 397. (M+H)+; Rt: 2.78 min.

Provenance & Evidence