反应详情

A solution of 2-bromo-3-methylbenzonitrile (0.40 g, 2.04 mmol) in THF (2.04 mL) under inert atmosphere was cooled to 0° C. in an ice-water bath. A solution of o-tolylmagnesium bromide, ˜2M in Et2O (1.22 mL, 2.45 mmol) was added dropwise via syringe. On completion of addition reaction mixture was allowed to warm to ambient temperature and then heated to 50° C. for 3 h. 2 mL of 2N aq. HCl was added carefully, the heating element was turned off and the reaction mixture allowed to be cooled to ambient temperature and stirred overnight. Then the reaction mixture was diluted with water (75 mL) and extracted with EtOAc (1×75 mL). The organic extract was washed with water (75 mL), saturated aqueous sodium bicarbonate (75 mL), and brine (75 mL) and dried over MgSO4. The solution was filtered and concentrated in vacuo to give the crude material as a light-yellow oil. The crude material was purified by column chromatography eluting with a gradient of 5-50% Et2O in hexane, to provide (2-bromo-3-methylphenyl)(o-tolyl)methanone as a white solid.

1. additionOn completion of addition reaction mixture
2. temperatureheated to 50° C. for 3 h
3. temperatureto be cooled to ambient temperature
4. extractionextracted with EtOAc (1×75 mL)
5. extractionThe organic extract
6. washwas washed with water (75 mL), saturated aqueous sodium bicarbonate (75 mL), and brine (75 mL)
7. dry with materialdried over MgSO4
8. filtrationThe solution was filtered
9. concentrationconcentrated in vacuo
10. customto give the crude material as a light-yellow oil
11. customThe crude material was purified by column chromatography
12. washeluting with a gradient of 5-50% Et2O in hexane