反应详情

The solution from 2-acetoxy-benzoic acid (0.6 g, 3.33 mmol) in ethanol (3.5 ml) is treated with a solution of caesium carbonate (0.54 g, 1.67 mmol) in water (35 ml) and stirred. After 30 min, the mixture is freeze-dried. The residue is added with stirring to a solution of [2S]-1,4-dioxa-spiro[4,5]dec-2-yl-methyl trifluoromethanesulphonate (1.15 g, 3.79 mmol) in N,N-dimethylformamide (10 ml). After 16 h at 20° C., the mixture is concentrated, the residue is taken up in dichloromethane (50 ml), and the solution is washed twice with water, dried over magnesium sulphate and concentrated. The residue is purified by column chromatography (toluene/ethyl acetate=50/1). Yield: 601 mg.

1. customthe mixture is freeze-dried
2. additionThe residue is added
3. waitAfter 16 h at 20° C.
4. concentrationthe mixture is concentrated
5. washthe solution is washed twice with water
6. dry with materialdried over magnesium sulphate
7. concentrationconcentrated
8. customThe residue is purified by column chromatography (toluene/ethyl acetate=50/1)