反应详情

To 2-methoxycarbonyl-3-chloro-4-(chloromethyl)thiophene (48 g, 0.21 mol) in glacial acetic acid (500 mL) was added sodium acetate (35 g, 0.42 mol). The reaction was heated at reflux for 24 hours, then cooled and concentrated in vacuo. The residual oil was made basic by addition of saturated aqueous sodium bicarbonate, and the resulting solution extracted with ethyl acetate (4×150 mL). The combined extracts were dried over sodium sulfate and concentrated to afford 47 g (90% yield) of 2-methoxycarbonyl-3-chloro-4-(acetoxymethyl)thiophene as a light brown oil; NMR (CDCl3) 7.6 (s, 1), 5.1 (s, 2), 3.9 (s, 3), 2.1 (s, 3) ppm.

1. temperatureThe reaction was heated
2. temperatureat reflux for 24 hours
3. temperaturecooled
4. concentrationconcentrated in vacuo
5. additionThe residual oil was made basic by addition of saturated aqueous sodium bicarbonate
6. extractionthe resulting solution extracted with ethyl acetate (4×150 mL)
7. dry with materialThe combined extracts were dried over sodium sulfate
8. concentrationconcentrated