反应详情

4-Methyl-4-nitropentanal is prepared by condensation of acrolein and 2-nitropropane according to a known procedure (Synthesis 1986, 237). To a solution of 4-methyl-4-nitropentanal (8.5 g, 58.56 mmol) in acetic acid (125 ml) is added bromine (9.12 g, 57.07 mmol) dropwise while the temperature is kept below 15° C. After stirring for 15 minutes at room temperature the reaction is poured into a mixture of water and ice (250 ml) and extracted two times with dichloromethane. The combined organic extracts are washed with water and with brine, successively, dried over magnesium sulfate, and the solvent is removed under reduced pressure to leave 10.7 g of 2-bromo-4-methyl-4-nitropentanal which is used for the next step without further purification.

1. customis kept below 15° C
2. extractionextracted two times with dichloromethane
3. washThe combined organic extracts are washed with water and with brine
4. dry with materialsuccessively, dried over magnesium sulfate
5. customthe solvent is removed under reduced pressure