反应详情

To a mixture of 1-bromo-2-(but-3-en-1-yl)benzene (1 g, 4.74 mmol) in THF (15 mL) at −78° C. was added BuLi (2.274 mL, 5.68 mmol) dropwise. It was stirred at this temperature for 1 h, then N,N-dimethylformamide (0.416 g, 5.68 mmol) was added and stirred at −78° C. for 30 min. then warmed up to rt and stirred at rt for 1 h. It was then quenched with NH4Cl, extracted with ether. The organic layer was then dried over MgSO4, filtered and concentrated to obtain 2-(but-3-en-1-yl)benzaldehyde (0.7 g, 92%) as an oil. 1H NMR (400 MHz, CDCl3) δ 10.35-10.26 (m, 1H), 7.86 (dd, J=7.6, 1.5 Hz, 1H), 7.54 (td, J=7.5, 1.6 Hz, 1H), 7.44-7.38 (m, 1H), 7.30 (d, J=8.1 Hz, 1H), 5.95-5.83 (m, 1H), 5.09-5.00 (m, 2H),), 3.20-3.12 (m, 2H), 2.44-2.36 (m, 2H).

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