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温度

0 °C

To a mixture of 4-hydroxybenzaldehyde (1.45 g, 11.9 mmol), triphenylphosphine (6.87 g, 26.2 mmol) and 2-fluoroethanol (1.68 g, 26.2 mmol) in dry THF (70 ml) at 0° C., was added DIAD (5.29 g, 26.2 mmol) dropwise. The reaction mixture was stirred at 0° C. for 1 h then allowed to rise to room temperature and stirred for 48 h. The solvent was removed under reduced pressure and the residue was purified by flash chromatography (5:1 DCM/Hexane) to give the title compound (0.807 g, 40%) as a colourless solid.

1. customto rise to room temperature
2. stirringstirred for 48 h
3. customThe solvent was removed under reduced pressure
4. customthe residue was purified by flash chromatography (5:1 DCM/Hexane)