反应详情

A solution of 15.12 g of furanacetic acid in 120 ml of methylene chloride is cooled to 0°; 15.6 g of chloromethylene-dimethylammonium chloride are added and the mixture is stirred for 10 minutes while cooling with ice. A solution of 30 g of 2-bromoethanol and 19.4 ml of pyridine in 60 ml of methylene chloride is then added dropwise with stirring and the reaction mixture is left to stand for 20 minutes while cooling with ice and for 1 hour at room temperature. The solution is extracted three times with a 5% aqueous sodium bicarbonate solution and once with a saturated aqueous sodium chloride solution, dried over sodium sulphate and distilled under reduced pressure. The 2-furanacetic acid 2-bromoethyl ester is obtained at 76°/0.25 mm; infrared absorption spectrum (in methylene chloride): characteristic bands at 3,44μ, 5,72μ, 6,10μ, 7,49μ, 8,20μ, 8,68μ, 9,31μ and 9,86μ.

1. temperaturewhile cooling with ice
2. stirringwith stirring
3. waitthe reaction mixture is left
4. waitto stand for 20 minutes
5. extractionThe solution is extracted three times with a 5% aqueous sodium bicarbonate solution
6. dry with materialonce with a saturated aqueous sodium chloride solution, dried over sodium sulphate
7. distillationdistilled under reduced pressure