反应详情

515 mg (1.67 mmol) of the compound from Example 5A and 818 mg (2.51 mmol) of cesium carbonate were suspended in 10 ml of acetonitrile, and 810 mg (1.84 mmol) of methyl 4-bromo-2-(bromomethyl)benzoate were added. The mixture was stirred under reflux for 3 h. After cooling to RT, 15 ml of water were added and the mixture was extracted three times with in each case 10 ml of ethyl acetate. The combined organic phases were dried over sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified chromatographically [Method 19]. This gave 455 mg (51% of theory) of the target compound.

1. temperatureunder reflux for 3 h
2. extractionthe mixture was extracted three times with in each case 10 ml of ethyl acetate
3. dry with materialThe combined organic phases were dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified chromatographically [Method 19]