反应详情

To a solution of ethyl cyanoacetate (916.0 g, 8.10 mol) in N,N-dimethylformamide (2.5 L) was added slowly glycolonitrile (700.0 g, 6.75 mol) in water (55% solution). To the mixture was added potassium carbonate (932.7 g, 6.75 mol), over 1.5 h, ensuring that the reaction temperature did not rise above 30° C. The reaction mixture was then stirred at room temperature overnight. The reaction mixture was filtered and the filtrate adjusted to pH 3 by addition of acid. The organic phase was separated and partially concentrated in vacuo. To the concentrate was added diethyl ether (1 L) and the solution was washed with water (5×1 L), dried (MgSO4) and concentrated in vacuo to give Preparation 46 (803 g).

1. customdid not rise above 30° C
2. filtrationThe reaction mixture was filtered
3. additionthe filtrate adjusted to pH 3 by addition of acid
4. customThe organic phase was separated
5. concentrationpartially concentrated in vacuo
6. additionTo the concentrate was added diethyl ether (1 L)
7. washthe solution was washed with water (5×1 L)
8. dry with materialdried (MgSO4)
9. concentrationconcentrated in vacuo
10. customto give