反应详情

温度

-78 °C

At −78° C., to a solution of 2-chloro-4-(trifluoromethyl)pyrimidine-5-carbonyl chloride (2.45 g, 10 mmol) in dry THF (50 mL) was added MeMgCl THF solution (3.0 M, 4 mL, 12 mmol) slowly and the reaction mixture was allowed to stir at −78° C. for 45 min. Sat. aq. NH4Cl (2 mL) and water (4 mL) were added. The aqueous layer was extracted with EtOAc (2×10 mL), and the combined extracts were dried with Na2SO4 and concentrated under reduced pressure. The crude residue was purified by silica chromatography eluting with EtOAc/hexanes (1/9) to give to give 1-(2-chloro-4-(trifluoromethyl)pyrimidin-5-yl)ethanone (675 mg, 30% yield). LC-MS m/z 225 [M+H]+. 1H NMR (400 MHz, CDCl3): δ 8.86 (s, 1H), 2.65 (s, 3H).

1. extractionThe aqueous layer was extracted with EtOAc (2×10 mL)
2. dry with materialthe combined extracts were dried with Na2SO4
3. concentrationconcentrated under reduced pressure
4. customThe crude residue was purified by silica chromatography
5. washeluting with EtOAc/hexanes (1/9)
6. customto give