反应详情

温度

20 °C

A mixture of sodium salt of 2-hydroxyimino-2-cyanoacetic acid amide (13.5 g), water (80 ml) and acetone (10 ml) is cooled with ice-water, and isobutyl chloroformate (13.7 g) is dropwise added thereto. The resulting mixture is, after adjusted to pH 7, stirred at a temperature lower than 20°C for 1 hour. The precipitated crystals are collected by filtration and washed with water to give 2-isobutoxycarbonyloxyimino-2-cyanoacetic acid amide (12.3 g). A part of the product is recrystallized from ethyl acetate to obtain crystals melting at 156° to 158°C.

1. additionis dropwise added
2. filtrationThe precipitated crystals are collected by filtration
3. washwashed with water