反应详情

To a stirred solution of 4-bromo-2,2-dimethyl-5-{4-(methylsulfonyl)phenyl}-3(2H)-furanone (112 mg) and tetrakis(triphenylphosphine)palladium(0) (54 mg) in 7 ml benzene and 1 ml ethanol, were added 2 M aqueous sodium carbonate (0.22 ml) and (3-chloro-4-fluorophenyl)boronic acid (82 mg). The reaction solution was kept at reflux for 24 hours. Then the solvent was evaporated off under reduced pressure. The resulting residue was extracted with 50 ml water and dichloromethane (50 ml×3). The organic layer was concentrated in vacuo and the resulting residue was separated by column chromatography (hexane/ethylacetate) to yield 32 mg of 4-(3-chloro-4-fluorophenyl)-2,2-dimethyl-5-{4-(methylsulfonyl)phenyl}-3(2H)-furanone as a solid. mp: 162-164° C. NMR: δ1.58 (s, 6H), 3.09 (s, 3H), 7.13 (m, 2H), 7.40 (d, J=6.6 Hz, 1H), 7.83 (d, J=8.1 Hz, 2H), 7.97 (d, J=8.1 Hz, 2H). IR (cm−1): 2930, 1700, 1587, 1503, 1404, 1317, 1150, 1068, 913, 771, 744.

1. temperatureat reflux for 24 hours
2. customThen the solvent was evaporated off under reduced pressure
3. extractionThe resulting residue was extracted with 50 ml water and dichloromethane (50 ml×3)
4. concentrationThe organic layer was concentrated in vacuo
5. customthe resulting residue was separated by column chromatography (hexane/ethylacetate)