4-Bromo-3-fluorobenzaldehyde → 1-(4-Bromo-3-fluorophenyl)ethan-1-ol

Beteiligte Stoffe

Reaktionsschritte

To a solution of 4-bromo-3-fluorobenzaldehyde (5 g, 24.75 mmol) in anhydrous tetrahydrofuran (100 mL) was added methyl magnesium bromide (3 M solution in tetrahydrofuran, 8.21 mL) at −45° C. under the atmosphere of nitrogen then stirred at room temperature. After 2 hours, LC-MS showed the desired product has received. The aqueous of ammonium chloride (15 mL) was added to quench the reaction, and extracted with ethyl acetate (50 mL), combined and concentrated the organic layers. The crude product was purified by column chromatography (petroleum ether/ethyl acetate=1:1) to give 1-(4-bromo-3-fluorophenyl)ethanol (4 g, 78%). LCMS (M+H+) m/z: calcd 217.97. found 218. 1H NMR (300 MHz, CD3OD): δ 7.92-7.87 (m, 1H), 7.23-7.19 (m, 1H), 7.07-7.10 (m, 1H), 4.80 (d, J=6.3 Hz, 1H), 1.41 (t, J=2.7 Hz, 3H).

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