反应详情

温度

90 °C

A solution of 24.4 g (200 mmol) of 4-hydroxybenzaldehyde in 100 ml of dimethylformamide is treated with 97.75 g (300 mmol) of caesium carbonate and stirred at 90° C. for 1 h. A solution of 66.93 g (300 mmol) of tert-butyl 2-bromisobutyrate in 100 ml of dimethylformamide is then added dropwise, and the mixture is stirred at 90° C. overnight. The dimethylformamide is distilled off under reduced pressure and the residue is then taken up in ethyl acetate, washed 2× with water, 2× with 1 N aqueous sodium hydroxide solution and 1× with sat. NaCl solution, dried over sodium sulphate and freed from the solvent under reduced pressure. This gives 16.6 g (31%) of tert-butyl 2-(4-formylphenoxy)-2-methylpropionate.

1. stirringthe mixture is stirred at 90° C. overnight
2. distillationThe dimethylformamide is distilled off under reduced pressure
3. washwashed 2× with water, 2× with 1 N aqueous sodium hydroxide solution and 1× with sat. NaCl solution
4. dry with materialdried over sodium sulphate