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温度

0 °C

To a solution of 6-bromo-3-fluoropicolinaldehyde (2.147 g, 10.5 mmol) and diethyl benzylphosphonate (2.413 mL, 11.6 mmol) in tetrahydrofuran (80 mL) at 0° C., was added potassium tert-butoxide(1M in tetrahydrofuran, 11.6 mL, 11.6 mmol) dropwise over a couple of minutes. When addition was complete, the reaction was allowed to stir at 0° C. for 45 min and quenched by addition of saturated ammonium chloride. The reaction was diluted with ether, washed with water (4×), then brine, dried over magnesium sulfate, and concentrated. Column chromatography (8%→15% EtOAc/Hex) gave 121 mg (4.1%). 1H NMR (CDCl3) δ: 7.86 (d, J=16.2 Hz, 1H), 7.64 (d, J=7.3 Hz, 2H), 7.39-7.47 (m, 2H), 7.22-7.39 (m, 4H). 19F NMR (CDCl3) δ: −130.05 (br. s., 1F). Mass spec.: 278.0 (MH)+.

1. additionWhen addition
2. customquenched by addition of saturated ammonium chloride
3. additionThe reaction was diluted with ether
4. washwashed with water (4×)
5. dry with materialbrine, dried over magnesium sulfate
6. concentrationconcentrated
7. customColumn chromatography (8%→15% EtOAc/Hex) gave 121 mg (4.1%)