反应详情

A mixture of 620 mg (2.1 mmol) 3,5-di-tert-butyl-2-methoxymethoxy phenylboronic acid, 377 mg (1.24 mmol) of 2-acetyl-4-iodo benzo[b]thiophene, 72 mg (0.105 mmol, 5%) Pd(PPh3)4 6 mL of ethanol, 1.25 mL of Na2CO3 in 8 mL of toluene was heated to reflux for 12 hours. After cooling and work-up, the crude product was purified over a short silica gel plug (eluent: ethyl acetate/hexane: 10/90) to give 368.6 mg (0.868 mmol, yield: 70%) of pure 2-acetyl-4-(2-methoxymethoxy-3,5-di-tert-butylphenyl)benzo[b]thiophene as a clear oil. 1H-NMR (CDCl3), δ: 7.84 (d, J=7.9 Hz, 1H), 7.79 (s, 1H), 7.53 (t, J=7.4 Hz, 1H), 7.46 (d, J=2.6 Hz, 1H), 7.44 (d, J=2.6 Hz, 1H), 7.19 (d, J=2.5 Hz, 1H), 4.47 (d, J=4.5 Hz, 1H), 4.06 (dd, J=14.2, 7.0 Hz, 2H), 2.81 (s, 3H), 2.54 (s, 3H), 2.02 (s, 3H), 1.49 (s, 9H), 1.33 (s, 9H), 1.23 (t, J=7.3 Hz, 3H).

1. temperaturewas heated
2. temperatureto reflux for 12 hours
3. temperatureAfter cooling
4. customthe crude product was purified over a short silica gel plug (eluent: ethyl acetate/hexane: 10/90)