反应详情

To a solution of 24.7 g (0.115 mol) of 4-methylamino-3-nitrobenzoic acid chloride and 22.3 g (0.115 mol) of N-(2-ethoxycarbonylethyl)aniline in 300 mL of tetrahydrofuran, 13.1 g (0.13 mol) of triethylamine were added dropwise in 15 minutes, with stirring, at room temperature. After 2 hours stirring, the solvent was distilled off in a water-jet vacuum and the residue was mixed with 700 mL of water with stirring. The mixture was extracted 3 times with 200 mL of dichloromethane, the organic extract was washed twice with 200 mL of 2N hydrochloric acid and twice with 300 mL of water and dried over sodium sulfate. The solvent was then distilled off and the oily product thus obtained was purified by column chromatography (1 kg silica gel; eluant: petroleum ether/ethyl acetate=2:1). Yield: 35.0 g (82% of theory); Rf value: 0.28 (silica gel; dichloromethane/ethanol=50:1).

1. stirringAfter 2 hours stirring
2. distillationthe solvent was distilled off in a water-jet vacuum
3. additionthe residue was mixed with 700 mL of water
4. stirringwith stirring
5. extractionThe mixture was extracted 3 times with 200 mL of dichloromethane
6. extractionthe organic extract
7. washwas washed twice with 200 mL of 2N hydrochloric acid and twice with 300 mL of water
8. dry with materialdried over sodium sulfate
9. distillationThe solvent was then distilled off
10. customthe oily product thus obtained
11. customwas purified by column chromatography (1 kg silica gel; eluant: petroleum ether/ethyl acetate=2:1)