反应详情

4-(2-Carboxy-ethyl)-benzoic acid methyl ester (5 g, 24 mmol) is dissolved in THF (50 ml), N,N-carbonyldiimidazole (4.25 g, 26.2 mmol) is added and stirred for 1 h at room temperature. Then sodium borohydride (1.9 g, 50 mmol) and water (10 ml) are added to the reaction mixture and stirred for additional 1 h. 1M HCl is added dropwise to the reaction mixture, extracted with ethyl acetate, the organic phase is dried and concentrated in vacuo. The residue is chromatographed on silica gel (dichloromethane/methanol) to afford the title compound. LC (method F): tR=1.83 min; Mass spectrum (ESI+): m/z=195 [M+H]+.

1. stirringstirred for additional 1 h
2. extractionextracted with ethyl acetate
3. customthe organic phase is dried
4. concentrationconcentrated in vacuo
5. customThe residue is chromatographed on silica gel (dichloromethane/methanol)