反应详情

To a solution of L-tyrosine methyl ester (4.00 g, 20.51 mmol) in methanol (150 ml) is added 1-nicotinoylacetone (3.68 g, 22.56 mmol), then the mixture is heated to reflux for 24 h. The solvent is evaporated under a vacuum. To the residue is added ethanol (50 ml), then the ethanol is distilled off under atmospheric pressure. The crude product is purified by silica gel chromatography using hexane/EtOAc (4:1) as eluent to give the title compound (5.51 g, 79%).

1. temperaturethe mixture is heated
2. temperatureto reflux for 24 h
3. customThe solvent is evaporated under a vacuum
4. additionTo the residue is added ethanol (50 ml)
5. distillationthe ethanol is distilled off under atmospheric pressure
6. customThe crude product is purified by silica gel chromatography