反应详情

To a solution of 3.75 g of 4-t-butylphenol in 40 ml of tetrahydrofuran was added 0.88 g of sodium hydride (oil dispersion). After stirring 30 minutes, 1 ml of hexamethylphosphoramide was added and a solution of 7.36 g of methyl α-bromo-α-[p-(p-nitrophenoxy)phenyl]acetate in 25 ml of tetrahydrofuran was added over a period of 30 minutes. The mixture was stirred at room temperature for 30 minutes and refluxed for 30 minutes. The mixture was poured into 130 ml of ice-water and extracted with dichloromethane. The extracts were washed with saturated sodium chloride solution and chilled. Filtration gave 2.1 g of product. The filtrate was concentrated to an oil under vacuum and chromatographed over silica gel (eluent-CCl4). From the first fractions there was obtained 4.3 g of solid which was dissolved in hot methanol and the volume reduced. Chilling gave 3.7 g of product as pale yellow crystals, mp 101°-103° C.

1. stirringThe mixture was stirred at room temperature for 30 minutes
2. temperaturerefluxed for 30 minutes
3. extractionextracted with dichloromethane
4. washThe extracts were washed with saturated sodium chloride solution
5. temperaturechilled
6. filtrationFiltration