反应详情

3.34 g (32.1 mmol) of malonic acid are dissolved in pyridine (10 ml), after the weakly exothermic reaction has subsided 3.0 g (26.7 mmol) of cyclohexanecarbaldehyde and 0.23 g (2.7 mmol) of piperidine are added, and the reaction mixture is heated to reflux for 4 h. The cooled reaction solution is added to a mixture of ice and concentrated hydrochloric acid, the aqueous phase is extracted three times with diethyl ether, the combined organic phases are dried over sodium sulfate, filtered, and the solvent is removed in vacuo. 4.42 g of product are obtained, which is reacted further without purification.

1. customafter the weakly exothermic reaction
2. additionare added
3. temperaturethe reaction mixture is heated
4. temperatureto reflux for 4 h
5. customThe cooled reaction solution
6. extractionthe aqueous phase is extracted three times with diethyl ether
7. dry with materialthe combined organic phases are dried over sodium sulfate
8. filtrationfiltered
9. customthe solvent is removed in vacuo