反应详情

温度

40 °C

To a mixture of potassium carbonate (19 g, 138 mmol, 5 equiv.) and methyl-4-aminobutyrate (IVc) (8.5 g, 55.3 mmol, 2 equiv.) in acetonitrile (70 ml, 14 vol.) is added methyl-(R)-2-bromobutyrate (IIf) (5 g, 27.6 mmol, 1 equiv.). The suspension is stirred at 40° C. for 19 hours. The mixture is then filtered and the cake is rinsed with 50 ml of acetonitrile. The filtrate is concentrated to dryness under reduced pressure and the residue is dissolved in isopropylactetate. The resulting organic layer is washed with 60 ml of water and is concentrated under vacuum to afford methyl-4-(1-methoxycarbonylpropylamino)butyrate (VIa) as a colourless oil (5.91 g, 27.2 mmol, 98%).

1. filtrationThe mixture is then filtered
2. washthe cake is rinsed with 50 ml of acetonitrile
3. concentrationThe filtrate is concentrated to dryness under reduced pressure
4. dissolutionthe residue is dissolved in isopropylactetate
5. washThe resulting organic layer is washed with 60 ml of water
6. concentrationis concentrated under vacuum