反应详情

A mixture of 4-methoxyphenylboronic acid (4.76 g, 31.3 mmol), Na2CO3 (32.6 2 N aqueous, 65.2 mmol), Pd(PPh3)4 (1.5 g, 1.3 mmol), 7-bromo-5-methylbenzofuran (5.5 g, 26.1 mmol), and ethylene glycol dimethyl ether (275 ml) was heated to reflux for 12 h. The reaction was cooled, ether (500 ml) was added and the layers separated. The aqueous was further extracted with ether and the organic layers were dried over anhydrous Na2SO4, passed through a silica plug and concentrated to 7.16 g brown oil. Further purification by column chromatography (10% EtOAc/hexanes) afforded 5.62 g (91%) product as a clear oil: 1H NMR (300 MHz, DMSO-d6): δ 3.44 (3H, s), 3.82 (3H, s), 6.94 (1H, d, J=2.2 Hz), 7.108 (2H, d, J=8.8 Hz), 7.30 (1H, s), 7.38 (1H, s), 7.81 (2H, d, J=8.8 Hz), 8.00 (1H, d, J=2.2 Hz).

1. temperaturewas heated
2. temperatureto reflux for 12 h
3. temperatureThe reaction was cooled
4. customthe layers separated
5. extractionThe aqueous was further extracted with ether
6. dry with materialthe organic layers were dried over anhydrous Na2SO4
7. concentrationconcentrated to 7.16 g brown oil
8. customFurther purification by column chromatography (10% EtOAc/hexanes)