反应详情

6.17 g (0.035 mol) of N-(4-cyanophenyl)glycine and 5.68 g (0.035 mol) of N,N'-carbonyldiimidazole were refluxed in 300 ml of tetrahydrofuran for 30 minutes, then 10.6 g (0.032 mol) of 3-amino-4-methylamino-benzoic acid-N-phenyl-N-(2-ethoxycarbonylethyl)-amide were added and the mixture was refluxed for a further five hours. Then the solvent was distilled off in vacuo, the residue was dissolved in 150 ml of glacial acetic acid and refluxed for one hour. Then the glacial acetic acid was distilled off in vacuo, the residue was dissolved in about 300 ml of dichloromethane, the solution was washed twice with about 150 ml water and then dried over sodium sulphate. After evaporation of the solvent the crude product thus obtained was purified by column chromatography (800 g silica gel; eluant: dichloromethane with 1-2% ethanol). Yield: 8.5 g (57% of theory), Rf value: 0.51 (silica gel; dichloromethane/ethanol=19:1)

1. temperaturethe mixture was refluxed for a further five hours
2. distillationThen the solvent was distilled off in vacuo
3. dissolutionthe residue was dissolved in 150 ml of glacial acetic acid
4. temperaturerefluxed for one hour
5. distillationThen the glacial acetic acid was distilled off in vacuo
6. dissolutionthe residue was dissolved in about 300 ml of dichloromethane
7. washthe solution was washed twice with about 150 ml water
8. dry with materialdried over sodium sulphate
9. customAfter evaporation of the solvent the crude product
10. customthus obtained
11. customwas purified by column chromatography (800 g silica gel; eluant: dichloromethane with 1-2% ethanol)