反应详情

温度

0 °C

2-Amino-5-chlorobenzonitrile (500 mg, 3.28 mmol) was dissolved in THF (10 mL), and while stirring the reaction solution at 0° C., cyclopropyl magnesium bromide (0.5 M THF solution, 26.4 mL) was added dropwise thereto. The reaction solution was stirred overnight under heating at 80° C., followed by ice-cooling, and 2 N hydrochloric acid was added thereto under ice-cooling. After the reaction solution was stirred at room temperature for 2 hours, the solution was diluted with ethyl acetate and then neutralized with a saturated aqueous sodium hydrogen carbonate solution. The organic layer was separated and washed with saturated brine and then dried over magnesium sulfate. After the drying agent was removed by filtration, the solvent was evaporated under reduced pressure. The resulting residue was purified by silica gel column chromatography (ethyl acetate/hexane=3/1), whereby (2-amino-5-chlorophenyl)(cyclopropyl)methanone (453 mg, 83%) was obtained as a yellow solid.

1. stirringThe reaction solution was stirred overnight
2. temperatureunder heating at 80° C.
3. temperaturecooling
4. temperatureunder ice-cooling
5. stirringAfter the reaction solution was stirred at room temperature for 2 hours
6. customThe organic layer was separated
7. washwashed with saturated brine
8. dry with materialdried over magnesium sulfate
9. customAfter the drying agent was removed by filtration
10. customthe solvent was evaporated under reduced pressure
11. customThe resulting residue was purified by silica gel column chromatography (ethyl acetate/hexane=3/1)