反应详情

温度

100 °C

A mixture of 4-bromo benzoic acid ethyl ester (2.7 mL, 16.5 mmol), 3-methyl phenylboronic acid (2.2 g, 16.2 mmol) and sodium carbonate (7.5 g, 70.8 mmol) in toluene:ethanol:water (75 mL:37 mL:37 mL), was flushed with nitrogen for 1 hour. After addition of the tetrakis(triphenylphosphine) palladium(0) catalyst (0.94 g, 0.81 mmol), the reaction was heated at 100° C. overnight. After cooling, the mixture was filtered through Celite which was then washed with ethyl acetate. The organic layer was washed with water, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo to give a brown oil. Purification of the residue by flash chromatography with a solvent gradient from 25% to 50% of dichloromethane in hexane provided the title compound (3.4 g, 87.3%) as a colorless oil.

1. customethanol:water (75 mL:37 mL:37 mL), was flushed with nitrogen for 1 hour
2. temperatureAfter cooling
3. filtrationthe mixture was filtered through Celite which
4. washwas then washed with ethyl acetate
5. washThe organic layer was washed with water
6. dry with materialdried over anhydrous sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customto give a brown oil
10. customPurification of the residue by flash chromatography with a solvent gradient from 25% to 50% of dichloromethane in hexane