反应详情

To a mixture of acetone (160 ml), sodium hydroxide (6.4 g) and water (200 ml) was added dropwise at 0° C. a mixture of 2-fluoro-5-methylbenzaldehyde and 5-fluoro-2-methylbenzaldehyde (about 1:7) (28.1 g) in acetone (40 ml), and the mixture was stirred at the same temperature for 1 hour. To the mixture was added 1N hydrochloric acid (160 ml), and acetone was evaporated under reduced pressure. The residue was extracted with ethyl acetate, and the organic layer was washed with water and saturated brine and concentrated under reduced pressure. The residue was purified with silica gel column chromatography (ethyl acetate-hexane) to give 4-(2-fluoro-5-methylphenyl)-3-buten-2-one (18.2 g).

1. additionwas added dropwise at 0° C.
2. customwas evaporated under reduced pressure
3. extractionThe residue was extracted with ethyl acetate
4. washthe organic layer was washed with water and saturated brine
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified with silica gel column chromatography (ethyl acetate-hexane)