反应详情

温度

-50 °C

A cooled and freshly distilled solution of 270 mg of pyruvic acid in 5 ml of chloroform is rapidly stirred into a solution of 700 mg of Tic-OBut and 630 mg of dicyclohexylcarbodiimide in 15 ml of anhydrous chloroform, the latter solution having been cooled to -50° C. The mixture is left for 16 hours in a deep-freezing cabinet (-20° C.), and the precipitated dicyclohexylurea is filtered off. The solution is washed with KHSO4 solution and then with KHCO3 solution, dried over Na2SO4, and concentrated in vacuo. The compound (oil) contains a little dicyclohexylurea, and was analyzed by chromatography over silica gel in the system CHCl3 /CH3OH 15:1.

1. temperatureA cooled
2. filtrationthe precipitated dicyclohexylurea is filtered off
3. washThe solution is washed with KHSO4 solution
4. dry with materialwith KHCO3 solution, dried over Na2SO4
5. concentrationconcentrated in vacuo