反应详情

A solution of methyl 2-bromo-5-phenylthiophene-3-carboxylate (11c) (290 mg, 0.97 mmol) and sodium hydroxide (156 mg, 3.90 mmol) in a mixture of ethanol (6 mL) and water (2 mL) was refluxed for 30 minutes. The mixture was concentrated in vacuo. The remained aqueous layer was washed with diethyl ether (5 mL), acidified with 1N hydrochloric acid until pH 3 and was extracted with dichloromethane (2×10 mL). The organic layer was dried over sodium sulfate and concentrated in vacuo to provide the desired acid (11d) (260 mg, 0.92 mmol, 95%), which was used without further purification.

1. temperaturewas refluxed for 30 minutes
2. concentrationThe mixture was concentrated in vacuo
3. washThe remained aqueous layer was washed with diethyl ether (5 mL)
4. extractionwas extracted with dichloromethane (2×10 mL)
5. dry with materialThe organic layer was dried over sodium sulfate
6. concentrationconcentrated in vacuo