反应详情

A total of 2.49 g of 3-bromo-4-fluorobenzaldehyde dimethylacetal produced in Production Example I-4-a was dissolved in 20 ml of dry tetrahydrofuran. After cooling to −78° C. in an atmosphere of nitrogen gas, 8.5 ml of a 1.56 M solution of n-butyllithium in hexane was added. After stirring for 30 minutes, 1.0 ml of N,N-dimethylformamide was added and the mixture was heated to room temperature. To the reaction mixture was added aqueous ammonium chloride solution, and the mixture was extracted with ethyl acetate for two times. The organic layer was washed with water, dried over anhydrous magnesium sulfate and the solvent was evaporated. The residue was purified and separated by silica gel column chromatography (ethyl acetate:hexane=1:12.5), to give 1.35 g of the title compound as a colorless oil.

1. additionwas added
2. extractionthe mixture was extracted with ethyl acetate for two times
3. washThe organic layer was washed with water
4. dry with materialdried over anhydrous magnesium sulfate
5. customthe solvent was evaporated
6. customThe residue was purified
7. customseparated by silica gel column chromatography (ethyl acetate:hexane=1:12.5)