Under argon, 0.50 g (1.7 mmol) of 4-(4-bromophenoxy)-2,5-dimethylaniline and 0.34 g (2.2 mmol) of 4-methoxyphenylboronic acid are dissolved in 10 ml of 1-butanol and the solution is admixed with 2.23 g (6.8 mmol) of cesium carbonate, 39.5 mg (0.03 mmol) of tetrakis(triphenylphosphine)palladium(0) and 2.5 ml of water. The reaction mixture is stirred at 80° C. for 16 h, poured into water and extracted repeatedly with ethyl acetate. The combined organic phases are dried over Na2SO4 and filtered and the solvent is removed under reduced pressure. This is followed by purification by column chromatography (0.44 g, purity 99.0%, yield 79.7%, log P (pH 2.3)=3.06).
