反应详情

Potassium tert-butoxide (780 mg, 6.96 mmol) was added in three portions over a period of 10 min to a stirred solution of ethyl 4-phenyl-1H-pyrrole-2-carboxylate (1.0 g, 4.63 mmol) in dimethylsulfoxide (10 mL) at 10° C. and maintained at this temperature for 30 min. A solution of 1-bromo-2-methoxy-ethane (770 mg, 5.50 mmol) in dimethylsulfoxide (2 mL) was added dropwise to the reaction mixture at 10° C. and then stirred for 2 h at room temperature. The reaction mixture was poured into ice water (25 mL) and the aqueous layer extracted with diethyl ether (3×20 mL). The combined organic layer was washed with water, brine (2×20 mL), dried over anhydrous sodium sulphate and concentrated under reduced pressure to afford ethyl 1-(2-methoxyethyl)-4-phenyl-pyrrole-2-carboxylate (1.15 g, 91%) as an oil.

1. temperaturemaintained at this temperature for 30 min
2. extractionthe aqueous layer extracted with diethyl ether (3×20 mL)
3. washThe combined organic layer was washed with water, brine (2×20 mL)
4. dry with materialdried over anhydrous sodium sulphate
5. concentrationconcentrated under reduced pressure