反应详情

温度

-78 °C

To a stirred solution of 4-bromobenzaldehyde diethyl acetal (107 g, 0.41 mol) in anhydrous THF (750 mL) was added n-BuLi (1.6 M in hexanes, 268 mL, 0.43 mol) dropwise at −78° C. After stirring for 1 h at −78° C., a solution of 15 (97.6 g, 0.34 mol) in THF (750 mL) was cannulated into the reaction mixture portionwise. The mixture was stirred overnight at RT, H2O (500 mL) was added, and the volatiles were removed under reduced pressure. The residue was extracted with Et2O (3×500 mL) and the combined extracts washed with H2O (500 mL) and brine (500 mL). The mixture was dried over MgSO4 and concentrated to afford 194 g of 16 that was used without further purification. 1HNMR (400 MHz, DMSO-d6): δ 0.58 (t, J=7.3 Hz, 3H), 1.12 (m, 6H), 1.52 (m, 1H), 1.70 (m, 1H), 3.23 (s, 3H), 3.40-3.65 (m, 5H), 4.98 (s, 2H), 5.41 (s, 1H), 5.51 (s, 1H), 6.62 (d, J=8.8 Hz, 2H), 6.96-7.06 (m, 3H), 7.17-7.23 (m, 4H), 7.31 (d, J=8.0 Hz, 2H), 7.61 (d, J=8.4 Hz, 2H).

1. stirringThe mixture was stirred overnight at RT
2. customthe volatiles were removed under reduced pressure
3. extractionThe residue was extracted with Et2O (3×500 mL)
4. washthe combined extracts washed with H2O (500 mL) and brine (500 mL)
5. dry with materialThe mixture was dried over MgSO4
6. concentrationconcentrated