反应详情

To a 100 mL dry round bottom flask containing vinylmagnesium bromide (1 M in THF) (24 mL, 24.00 mmol) under Ar at 0° C. was added 3-chloro-2,6-difluorobenzaldehyde (3.2 g, 18.13 mmol) in THF (10 mL) dropwise. The reaction was stirred for 1 h and quenched with 1 N HCl to pH 2. The mixture was extracted with Et2O (3×). The combined organic layer was washed with brine, dried over MgSO4, filtered, and concentrated to yield the desired product (3.71 g, 100%) as pale yellow oil. 1H NMR (500 MHz, CDCl3) δ 7.34 (ddd, J=8.9, 8.1, 5.8 Hz, 1H), 6.90 (td, J=9.2, 1.7 Hz, 1H), 6.23 (dddt, J=17.2, 10.4, 5.8, 1.2 Hz, 1H), 5.60 (dd, J=7.6, 6.7 Hz, 1H), 5.40-5.31 (m, 1H), 5.28 (dt, J=10.2, 1.2 Hz, 1H), 2.38 (dt, J=8.3, 1.9 Hz, 1H).

1. customTo a 100 mL dry round bottom flask
2. customquenched with 1 N HCl to pH 2
3. extractionThe mixture was extracted with Et2O (3×)
4. washThe combined organic layer was washed with brine
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated