反应详情

温度

110 °C

7-Bromo-1-methyl-1,3-dihydro-2H-benzimidazol-2-one (2.20 g, 9.69 mmol) was dissolved in 30 mL of phosphorous oxychloride and the mixture was heated at 110° C. for 2 days. The reaction allowed to cool to room temperature, poured into water with an ice, and stirred for 1 h. The aqueous solution was extracted with ethyl acetate. The extract was washed with aqueous sodium bicarbonate, dried over magnesium sulfate, filtered and concentrated in vacuo to give 2.32 g of the title compound, which was used in the next reaction without further purification.

1. temperatureto cool to room temperature
2. extractionThe aqueous solution was extracted with ethyl acetate
3. washThe extract was washed with aqueous sodium bicarbonate
4. dry with materialdried over magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo