反应详情

温度

80 °C

The reaction is carried out using inert conditions (argon or nitrogen atmosphere, dry solvents). A suspension of 6.4 g (36.0 mmol) of (4-tert-butylphenyl)boronic acid, 6.0 g (30.0 mmol) of 4-bromo-2,5-dimethylaniline, 29.3 g (90 mmol) caesium carbonate and 0.7 g (0.6 mmol) tetrakis(triphenylphosphin)palladium in 75 ml of 1,2-dimethoxyethan was stirred for 16 hrs at 80° C. At room temperature 25 ml of water and 75 ml of toluene were added. The organic layer was separated, the watery layer was again extracted using 75 ml of toluene. The combined organic layers were dried over magnesium sulfate and concentrated in vacuo. Column chromatographic (cyclohexane/ethylacetate:2/1) yielded 5.5 g (21.7 mmol) 72% of 4′-tert-butyl-2,5-dimethylbiphenyl-4-amine (log P (pH 2.3)=3.65.

1. customThe organic layer was separated
2. extractionthe watery layer was again extracted
3. dry with materialThe combined organic layers were dried over magnesium sulfate
4. concentrationconcentrated in vacuo