反应详情

125 g of 2,4-dichlorobenzyl chloride are added at room temperature to a mixture of 700 g of 50% sodium hydroxide, 23 g of tetrabutylammonium iodide and 130 g of α-(3-pyridyl)-4-morpholineacetonitrile. After 2 hours the mixture is extracted with diethyl ether. After evaporation of the ether, the crude product, α-(2,4-dichlorobenzyl)-α-(3-pyridyl)-4-morpholineacetonitrile (m.p. 130°-132°), remains behind. The crude product is taken up in 300 ml of concentrated hydrochloric acid and the solution is heated to reflux temperature for 12 hours. The reaction mixture is made basic and extracted with ethyl acetate, and the organic phase is washed, dried over anhydrous sodium sulfate and concentrated. Crystallization from ethyl acetate/n-hexane yields 2,4-dichlorobenzyl 3-pyridyl ketone of melting point 78°-79°.

1. extractionAfter 2 hours the mixture is extracted with diethyl ether
2. customAfter evaporation of the ether
3. temperaturethe solution is heated
4. temperatureto reflux temperature for 12 hours
5. extractionextracted with ethyl acetate
6. washthe organic phase is washed
7. dry with materialdried over anhydrous sodium sulfate
8. concentrationconcentrated
9. customCrystallization from ethyl acetate/n-hexane