反应详情

温度

0 °C

A mixture of diethyl 2-hydroxyiminomalonate (18.9 g), water (50 ml) and acetone (8 ml) is cooled at 0°C, and ethyl chloroformate (9.8 g) is dropwise added thereto. The resulting mixture is, after adjusted to pH 7 to 8 with the addition of an aqueous solution of sodium hydrogencarbonate, stirred at room temperature for 4 hours. The reaction mixture is extracted with ether, and the ether layer is washed with an aqueous solution of sodium chloride, dried and concentrated to give diethyl 2-ethoxycarbonyloxyiminomalonate (24 g) as an oil.

1. extractionThe reaction mixture is extracted with ether
2. washthe ether layer is washed with an aqueous solution of sodium chloride
3. customdried
4. concentrationconcentrated