反应详情

Acetyl chloride (1.5 ml, 1.66 g, 21 mmole) and Et3N (3 ml, 2.18 g, 21.5 mmole) were added, sequentially, to a solution of 6-hydroxy-2-methylbenzo[b] thiophene 8a (2.51 g, 15 mmole) in THF (120 ml) at 0°. The reaction was left stirring for 14 hours, gradually warming to ambient temperature, then diluted with EtOAc (100 ml) and washed with H2O (100 ml) and brine (100 ml). The combined aqueous layers were extracted with EtOAc (100 ml). The combined organic extracts were subsequently dried over Na2SO4 and concentrated, in vacuo, to give 3.9 g of a yellow solid which was purified by silica gel chromatography. Elution with hexane: Et2O (90:10) and evaporation of the appropriate fractions gave 2.93 g (93%) of a white solid. 1H NMR (DMSO-d6) δ7.70 (1H, d, J=8.6 Hz), 7.66 (1H, d, J=2.2 Hz), 7.12 (1H, s), 7.07 (1H, dd, J=2.2, 8.6 Hz), 2.54 (3H, s), 2.27 (3H, s). Anal Calcd. for C11H10O2S: C, 64.05; H, 4.89; S, 15.55. Found: C, 63.84; H, 4.93; S, 15.57.

1. customat 0°
2. waitThe reaction was left
3. washwashed with H2O (100 ml) and brine (100 ml)
4. extractionThe combined aqueous layers were extracted with EtOAc (100 ml)
5. dry with materialThe combined organic extracts were subsequently dried over Na2SO4
6. concentrationconcentrated, in vacuo