反应详情

16.5 g of an 80% dispersion of sodium hydride in oil are suspended in 200 ml of dry tetrahydrofuran. A solution of 100 g of 3,4-dichlorophenylacetonitrile in 500 ml of tetrahydrofuran is added dropwise at 20° C. over 30 minutes and the reaction mixture is then stirred at room temperature for 2 hours. The mixture is cooled to -20° C., a solution of 118 g of 1-bromo-2-tetrahydropyranyloxyethane in 100 ml of tetrahydrofuran is added, the mixture is allowed to warm up to room temperature and, after 2 hours, a solution of 50 g of ammonium chloride in 3 liters of water is added. Extraction is carried out with 1.5 liters of ether and the extract is washed with a saturated solution of NaCl, decanted, dried over MgSO4 and concentrated under vacuum. The residue is chromatographed on silica gel using CH2Cl2 and then ethyl acetate (95/5 v/v) as the eluent. The pure product fractions are concentrated under vacuum to give 118 g of an oil.

1. temperatureThe mixture is cooled to -20° C.
2. temperatureto warm up to room temperature and, after 2 hours
3. extractionExtraction
4. washthe extract is washed with a saturated solution of NaCl
5. customdecanted
6. dry with materialdried over MgSO4
7. concentrationconcentrated under vacuum
8. customThe residue is chromatographed on silica gel
9. concentrationThe pure product fractions are concentrated under vacuum