反应详情

To a suspension of methyl 2-oxo-2,3-dihydro-1H-benzimidazole-4-carboxylate (513 mg, 2.67 mmol) in tetrahydrofuran (5 mL) was added 3M solution of ethyl magnesium bromide in diethyl ether (3.6 ml, 10.7 mmol), and the mixture was stirred at room temperature for 1 hour and refluxed for 20 hours. Addition of 3M solution of ethyl magnesium bromide in diethyl ether (5.3 mL, 16.0 mmol) was followed by refluxing for 30 hours. The reaction mixture was acidified with 6 N hydrochloric acid and extracted with ethyl acetate (X2). The combined organic layer was washed with brine (X1), dried over sodium sulfate and concentrated in vacuo. The resulting solid was washed with diisopropyl ether to give 440 mg (2.00 mmol, 74.8%) of the title compound.

1. temperaturerefluxed for 20 hours
2. temperatureby refluxing for 30 hours
3. extractionextracted with ethyl acetate (X2)
4. washThe combined organic layer was washed with brine (X1)
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated in vacuo
7. washThe resulting solid was washed with diisopropyl ether