反应详情

4-Bromo-benzoic acid methyl ester (3 g) was dissolved in a mixture of toluene (20 mL) and ethanol (20 mL). 2,4-Dichloro-phenyl boronic acid (3 g) was added followed by 2 M Na2CO3 (20 mL). The mixture was stirred vigorously under N2 and (PPh3)4Pd (0.5 g) added. The mixture was refluxed with stirring for 3 hours under an atmosphere of N2. The solvent was removed under vacuum, the residue was dissolved in ethyl acetate, and washed with water and saturated NaCl solution. After drying (Na2SO4), the solvent was evaporated and the resultant oil purified by column chromatography to give a fluffy white powder, which was recrystallised from ethanol to give the title compound as long needles. 13C NMR (CDCl3): δ 52.3, 127.3, 129.5, 129.5, 129.6, 129.9, 131.9, 133.1, 134.4, 138.1, 142.8 and 166.8. 1H NMR (CDCl3): δ 3.93 (3H, s), 7.27 (2H, m), 7.47 (2H, d, J=8.5 Hz), 7.49 (1H, s) and 8.09 (2H, d, J=8.2 Hz).

1. temperatureThe mixture was refluxed
2. stirringwith stirring for 3 hours under an atmosphere of N2
3. customThe solvent was removed under vacuum
4. dissolutionthe residue was dissolved in ethyl acetate
5. washwashed with water and saturated NaCl solution
6. dry with materialAfter drying (Na2SO4)
7. customthe solvent was evaporated
8. customthe resultant oil purified by column chromatography
9. customto give a fluffy white powder, which
10. customwas recrystallised from ethanol