反应详情

To a stirred solution of p-nitrobenzyl chloride (15 g) and diethyl benzylmalonate (22 g) in N,N-dimethylformamide (150 ml) was added NaH (60% in oil, 3.8 g). After stirring at room temperature for 2 days, the reaction mixture was concentrated under reduced pressure and the residue was suspended in ethyl acetate. The ethyl acetate layer was washed with aqueous citric acid solution, water, saturated aqueous sodium hydrogen carbonate solution and brine, and dried (MgSO4). The organic solvent was evaporated off and the residual oil was purified by column chromatography on silica gel. Elution with ethyl acetate-hexane (1:6, v/v) gave diethyl benzyl-4-nitrobenzylmalonate (24 g, 71%) as crystals. Melting point: 70°-71° C.

1. concentrationthe reaction mixture was concentrated under reduced pressure
2. washThe ethyl acetate layer was washed with aqueous citric acid solution, water, saturated aqueous sodium hydrogen carbonate solution and brine
3. dry with materialdried (MgSO4)
4. customThe organic solvent was evaporated off
5. customthe residual oil was purified by column chromatography on silica gel
6. washElution with ethyl acetate-hexane (1:6, v/v)