反应详情

To a solution of (3-carboxypropy)triphenylphosphonium bromide (25 g, 58.3 mmol) in DMSO (53 mL) was added t-BuOK (12.4 g, 110.7 mmol). The mixture was stirred at rt for 20 min. Then a solution of 3-Bromo-benzaldehyde (9.3 g, 50.3 mmol) in DMSO (15 mL) was added dropwise. The reaction mixture was stirred at rt for 4 h. The mixture was poured in water and extracted with DCM. The organic layer was dried over anhydrous sodium sulfate, filtered, and then concentrated under reduced pressure. The crude material was purified by silica gel chromatography using a solvent system of 5:1 petroleum ether/EtOAc to give 5-(3-Bromo-phenyl)-pent-4-enoic acid (4.8 g, 38%). 1H-NMR (400 MHz, CDCl3) δ ppm 7.45 (s, 1H), 7.2-7.25 (m, 1H), 7.1-7.15 (m, 2H), 6.4-6.45 (m, 1H), 6.23-6.3 (m, 1H), 2.4-2.6 (m, 4H).

1. stirringThe reaction mixture was stirred at rt for 4 h
2. extractionextracted with DCM
3. dry with materialThe organic layer was dried over anhydrous sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe crude material was purified by silica gel chromatography