反应详情

2-tert-Butoxycarbonylamino-pent-4-enoic acid (9.3 g, 43.3 mmol) in acetone (70 mL) is treated with solid potassium carbonate (11.9 g, 86.6 mmol) followed by methyl iodide (5.4 mL, 86.6 mmol). The resulting mixture is heated to reflux for 4 h and then allowed to cool to RT. The solvent is removed in vacuo and the crude residue is dissolved in EtOAc, washed with water, saturated sodium hydrogen carbonate solution, brine, dried (MgSO4) and concentrated in vacuo. The crude residue is purified by flash chromatography (SiO2, iso-hexane:EtOAc 7:3) to afford the title compound as a light-yellow oil.

1. temperatureThe resulting mixture is heated
2. temperatureto reflux for 4 h
3. customThe solvent is removed in vacuo
4. dissolutionthe crude residue is dissolved in EtOAc
5. washwashed with water, saturated sodium hydrogen carbonate solution, brine
6. dry with materialdried (MgSO4)
7. concentrationconcentrated in vacuo
8. customThe crude residue is purified by flash chromatography (SiO2, iso-hexane:EtOAc 7:3)