反应详情

温度

80 °C

NaBr (420 mg, 131 μL, 4.08 mmol) was added to a solution of (S)-(4,4-difluoro-1-(4-nitro-3-(trifluoromethyl)phenyl)pyrrolidin-2-yl)methyl methanesulfonate (330 mg, 0.82 mmol) in acetonitrile (2.0 mL) and heated at 80° C. for 16 h. The reaction mixture was diluted with ethyl acetate (10 mL) and water (5 mL). The organic layer was separated, dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by silica gel column chromatography (15-50% ethyl acetate/hexane) to obtain (S)-2-(bromomethyl)-4,4-difluoro-1-(4-nitro-3-(trifluoromethyl)phenyl)pyrrolidine (230 mg, 72%) as a yellow oil. 1H NMR (400 MHz, DMSO-d6) δ 8.14 (d, J=8.7 Hz, 1H), 7.09-7.07 (m, 2H), 4.76-4.71 (m, 1H), 4.16-3.99 (m, 2H), 3.74 (dd, J=10.6, 3.0 Hz, 1H), 3.60 (t, J=9.7 Hz, 1H), 2.94-2.80 (m, 1H), 2.66-2.55 (m, 1H).

1. customThe organic layer was separated
2. dry with materialdried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated in vacuo
5. customThe residue was purified by silica gel column chromatography (15-50% ethyl acetate/hexane)