反应详情

With ice-cooling, a solution of 73.0 g (0.985 mol) of tert-butanol, 190 g (1.877 mol) of triethylamine and 0.573 g (0.0047 mol) of DMAP in 750 ml of dichloromethane is treated with a solution of 100 g (0.939 mmol) of isobutyryl chloride in 150 ml of dichloromethane, and the mixture is then stirred overnight. 500 ml of 2 M hydrochloric acid are then added, the aqueous phase is extracted with dichloromethane and the combined organic phases are washed with water, sat. NaHCO3 solution and sat. NaCl solution, dried over sodium sulphate and concentrated. Distillative purification of the crude product gives 65.5 g (48%) of tert-butyl 2-methylpropionate.

1. temperatureWith ice-cooling
2. extractionthe aqueous phase is extracted with dichloromethane
3. washthe combined organic phases are washed with water, sat. NaHCO3 solution and sat. NaCl solution
4. dry with materialdried over sodium sulphate
5. concentrationconcentrated
6. distillationDistillative purification of the crude product