反应详情

温度

-20 °C

To a solution of 8.8 g of diisopropylamine in 150 ml of dry tetrahydrofuran were added 50 ml (1.5 mmole/ml) of n-butyl lithium at -50° C. After stirring at -20° C. for 30 minutes, 10.0 g of 4-ethoxyphenylacetonitrile was added thereto at -50° C. After stirring at the same temperature for 1 hour, 10.1 g of methyl iodide was added dropwise at -50° C. After stirring at the same temperature for 3 hours and then at 20° C. for 10 hours, the reaction solution was poured into 10% aqueous hydrochloric acid and extracted with ethyl acetate. After concentrating the ethyl acetate layer, the residual oil was column-chromatographed on silica gel (developing solvent, n-hexane: ethyl acetate=20:1) to obtain 9.50 g of the desired 2-(4-ethoxyphenyl) propionitrile [corresponding to the compound represented by the foregoing formula (II) wherein R1 is an ethoxy group, R2 is a hydrogen atom and R4 is a methyl group] as a pale yellow oil.

1. customat -50° C
2. stirringAfter stirring at the same temperature for 1 hour
3. stirringAfter stirring at the same temperature for 3 hours
4. waitat 20° C. for 10 hours
5. extractionextracted with ethyl acetate
6. concentrationAfter concentrating the ethyl acetate layer
7. customthe residual oil was column-chromatographed on silica gel (developing solvent, n-hexane: ethyl acetate=20:1)