反应详情

温度

15 °C

Aqueous formaldehyde (161 ml, 37%) was added slowly to a solution of ethyl hydrogen malonate (132g) and dimethylamine (350 ml, 26% aqueous) in water (150 ml) at 15° C. The mixture was stirred at 15° C for 30 minutes, heated slowly to 40° C and stirred for a further 30 minutes. Decarboxylation commenced at 26° C. After cooling, the organic material which had separated as a colourless oil was extracted with ether (3 × 250 ml). The ether extracted was dried over anhydrous sodium sulphate and evaporated at atmospheric pressure. The residue was shown to be a mixture by the appearance of two carbonyl peaks (1740 cm-1 and 1720 cm-1) in the infrared spectrum. The mixture was distilled under vacuum to give ethyl 2-dimethylaminomethylacrylate (50g, 32% boiling point 34° C/0.7mm; νc=o 1722cm-1) and ethyl 1,3-bis (dimethylamino) propane-2-carboxylate (87g, 43%, boiling point 58° C/0. 8mm;νc=o 1740 cm-1).

1. temperatureheated slowly to 40° C
2. stirringstirred for a further 30 minutes
3. customcommenced at 26° C
4. temperatureAfter cooling
5. customthe organic material which had separated as a colourless oil
6. extractionwas extracted with ether (3 × 250 ml)
7. extractionThe ether extracted
8. dry with materialwas dried over anhydrous sodium sulphate
9. customevaporated at atmospheric pressure
10. distillationThe mixture was distilled under vacuum