反应详情

温度

70 °C

To a suspension of sodium hydride (NaH, 60%, 0.40 g, 10.0 mmol) in dry DMF (10 mL) under ice cooling was added dimethyl malonate (1.04 mL, 9.1 mmol) dropwise followed by a solution of 1-bromo-2-fluoro-4-nitrobenzene (1.00 g, 4.55 mmol) in dry DMF (3 mL) under an argon atmosphere. The resulting mixture was stirred at 70° C. overnight and then allowed to cool to 21° C. The reaction mixture was quenched with saturated NH4Cl and extracted with ethyl acetate (2×50 mL). The organic layer was dried over MgSO4, concentrated and the residue was purified with silica gel column chromatography (hexane:ethyl acetate, 2:1) to give Dimethyl 2-(2-fluoro-4-nitrophenyl)malonate (86) (0.90 g, 73%) as a light yellowish solid: 1H NMR δ 8.07 (dd, 1H, J=8.6, 2.2 Hz), 7.98 (dd, 1H, J=9.3, 2.2 Hz), 7.74 (dd, 1H, J=8.6, 7.1 Hz), 5.08 (s, 1H), 3.81 (s, 6H).

1. temperatureto cool to 21° C
2. customThe reaction mixture was quenched with saturated NH4Cl
3. extractionextracted with ethyl acetate (2×50 mL)
4. dry with materialThe organic layer was dried over MgSO4
5. concentrationconcentrated
6. customthe residue was purified with silica gel column chromatography (hexane:ethyl acetate, 2:1)