反应详情

温度

25 °C

A solution of 5-acetylthiophene-2-carboxylic acid (7 g, 41 mmol) in DMA (100 mL) was treated with 2-methyl-2-propanol (54 mL, 576 mmol), DMAP (3 g, 25 mmol), and EDCI (9.9 g, 51.5 mmol). The resulting mixture was stirred at 25° C. for 16 h. Water (200 mL) was added and the mixture was extracted with ethyl ether (350 mL). The organic phase was washed with 1 N HCl (100 mL), water (3×100 mL), saturated aqueous NaHCO3 (100 mL), and brine (100 mL); dried (Na2SO4); filtered; and evaporated to afford 6.7 g (72%) of the title compound as a tan solid. 1H NMR (300 MHz, DMSO-D6) δ ppm 1.53 (s, 9H) 2.58 (s, 3H) 7.75 (d, J=3.68 Hz, 1H) 7.92 (d, J=3.68 Hz, 1H); MS (DCI) 227 m/z (M+H)+.

1. extractionthe mixture was extracted with ethyl ether (350 mL)
2. washThe organic phase was washed with 1 N HCl (100 mL), water (3×100 mL), saturated aqueous NaHCO3 (100 mL), and brine (100 mL)
3. dry with materialdried (Na2SO4)
4. filtrationfiltered
5. customand evaporated