反应详情

7-Bromo-benzo[b]thiophene (See Amin et al., J. Chem Soc. Perkin Trans., vol. 2, pp.1489-1492 (1982), incorporated herein by reference), (2.49 g, 11.7 mmol) was stirred in benzene (25 mL) with acetic anhydride (3.31 mL, 35.1 mmol) under argon. Tin (IV) chloride (4.1 mL, 35.1 mmol) in benzene (15 mL) was added slowly, and the reaction stirred at reflux under argon for 2 h. The red solution was allowed to cool, and was poured over ice water (60 mL). Ether (100 mL) was added, and organics were separated, washed with water (50 mL), sat NaHCO3 (50 mL), brine (50 mL), dried (Na2SO4), and concentrated in vacuo. Purification by silica gel chromatography (10% EtOAc/hexanes) gave 1.92 g (64%) of 3-acetyl-7-bromo-benzo[b]thiophene as a white solid. 1H NMR (300 MHz, CDCl3) δ8.74 (d, 1H, J=7.8 Hz), 8.33 (s, 1H), 7.58 (d, 1H, J=7.8 Hz), 7.38 (t, 1H, J=7.8 Hz),2.65 (s, 3H). Anal. (C10H7BrOS) C, H. Calculated C=47.08, H=2.77; found C=47.03; H=2.78. In addition, 490 mg (16%) of the more polar 2-acetyl-7-bromo-benzo[b]thiophene was isolated. 1H NMR (300 MHz, CDCl3) □ 8.02 (s, 1H), 7.85 (d, 1H, J=7.8 Hz), 7.62 (d, 1H, J=7.8 Hz), 7.30 (t, 1H, J=7.8 Hz), 2.67 (s, 3H).

1. temperatureat reflux under argon for 2 h
2. temperatureto cool
3. customorganics were separated
4. washwashed with water (50 mL)
5. dry with materialdried (Na2SO4)
6. concentrationconcentrated in vacuo
7. customPurification by silica gel chromatography (10% EtOAc/hexanes)