反应详情

A mixture of 4-(3-hydroxy-4-methoxyphenyl)-2-pyrrolidone (63 mg, 0.3 mmol), 4-chlorophenylboronic acid (61 mg, 0.45 mmol), copper (II) acetate (54 mg, 0.3 mmol), triethylamine (152 mg, 1.5 mmol), dichloromethane (3 mL) and small amount of molecular sieves was allowed to stir at ambient temperature. After 18 hours, the mixture was filtered over celite and the filtrate was concentrated in vacuo. The resulting residue was dissolved in 30 mL of ethyl acetate and washed successively with saturated aqueous sodium bicarbonate solution and brine. Purification by flash column chromatography (ethyl acetate/hexane 1:1 to methanol/dichloromethane 3:97) gave 26 mg (27%) of 4-(3-(4-chlorophenyloxy)-4-methoxyphenyl)-2-pyrrolidone: 1H NMR (300 MHz, CDCl3) δ 7.24 (d, J=9.2 Hz, 2H), 7.03 (d, J=8.4 Hz, 1H), 6.95 (d, J=8.4 Hz, 1H), 6.87 (s, 1H), 6.83 (d, J=9.2 Hz, 2H), 5.83 (b, 1H), 3.80 (s, 3H), 3.72 (t, J=8.4 Hz, 1H), 3.65-3.62 (m, 1H), 3.34 (t, J=8.4 Hz, 1H), 2.68 (dd, J=16.8, 8.8 Hz, 1H), 2.41 (dd, J=16.8, 9.2 Hz, 1H).

1. filtrationthe mixture was filtered over celite
2. concentrationthe filtrate was concentrated in vacuo
3. dissolutionThe resulting residue was dissolved in 30 mL of ethyl acetate
4. washwashed successively with saturated aqueous sodium bicarbonate solution and brine
5. customPurification by flash column chromatography (ethyl acetate/hexane 1:1 to methanol/dichloromethane 3:97)