反应详情

To a mixture of 1-bromo-3-(but-3-en-1-yl)benzene (0.5 g, 2.369 mmol) in tetrahydrofuran (10 mL) at −78° C. was added BuLi (1.137 mL, 2.84 mmol) dropwise. It was then stirred at this temperature for 1 h, then N,N-dimethylformamide (0.208 g, 2.84 mmol) was added. The reaction mixture was stirred at −78° C. for 30 min, then rt for 3 h. It was then quenched with NH4Cl, extracted with ether. The organic layer was dried over MgSO4, filtered and concentrated to obtain 3-(but-3-en-1-yl)benzaldehyde (0.3 g, 79%) as an oil. 1H NMR (400 MHz, CDCl3) δ 10.03 (s, 1H), 7.77-7.72 (m, 2H), 7.51-7.46 (m, 2H), 5.86 (ddt, J=17.1, 10.3, 6.6 Hz, 1H), 5.10-5.00 (m, 2H), 2.86-2.79 (m, 2H), 2.48-2.39 (m, 2H).

1. stirringThe reaction mixture was stirred at −78° C. for 30 min
2. waitrt for 3 h
3. customIt was then quenched with NH4Cl
4. extractionextracted with ether
5. dry with materialThe organic layer was dried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated