反应详情

Methyl 3-hydroxy-2-(4-nitro-benzenesulfonylamino)-propionate (4.0 g, 13.1 mmol) and potassium carbonate anhydride (5.45 g, 39.4 mmol) were suspended in DMF (25 mL), and ethyl bromoacetate (2.91 mL, 26.3 mmol) was added dropwise at 0° C. After stirring for 4 hours, 50 mL of distilled water and 100 mL of acetate were introduced and stirred to separate layers. The supernatant was washed with 50 mL of a 5% Na2S2O3 aqueous solution, 50 mL of a 1N HCl aqueous solution, 50 mL of a saturated NaHCO3 aqueous solution, and 100 mL of distilled water, and it was dried and concentrated under reduced pressure. The mixture was separated with hexane and ethylacetate (2:1) in a silica gel column to obtain a yellow oil (4.43 g, 86.5).

1. stirringstirred
2. customto separate layers
3. washThe supernatant was washed with 50 mL of a 5% Na2S2O3 aqueous solution, 50 mL of a 1N HCl aqueous solution, 50 mL of a saturated NaHCO3 aqueous solution, and 100 mL of distilled water, and it
4. customwas dried
5. concentrationconcentrated under reduced pressure
6. customThe mixture was separated with hexane and ethylacetate (2:1) in a silica gel column
7. customto obtain a yellow oil (4.43 g, 86.5)