反应详情

Added together were 3-t-butylphenylboronic acid (4.0 g, 22.4 mmol), 2-bromo-4-t-butyl aniline (4.3 g, 18.7 mmol), palladium(II)acetate (0.11 g, 0.468 mmol), triphenyl phosphine (0.5 g, 1.8 mmol), and 25 mL of a 2 M solution of potassium carbonate in 36 mL of ethylene glycol dimethyl ether. The reaction mixture was heated at reflux for 18 hours. The reaction was cooled to room temperature and the aqueous phase was separated from the organic phase. The aqueous phase was extracted with ethyl acetate. The organic extractions were combined, dried over magnesium sulfate filtered and concentrated. The crude product was purified by column chromatography using 20% ethyl acetate and hexanes as the eluants. The pure product 2-amino-3′,5-di-tert-butyl biphenyl (3.0 g, 57% yield) was collected as a white solid whose NMR was consistent with the proposed structure.

1. temperatureThe reaction mixture was heated
2. temperatureat reflux for 18 hours
3. customthe aqueous phase was separated from the organic phase
4. extractionThe aqueous phase was extracted with ethyl acetate
5. extractionThe organic extractions
6. dry with materialdried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated
9. customThe crude product was purified by column chromatography