反应详情

温度

130 °C

A mixture of 4-formyl-3-hydroxybenzoic acid (1.5 g, 8.8 mmol), 4-methyl-benzenesulfinic acid 3-methoxy-propyl ester (4.5 g, 18.4 mmol), diisopropylethylamine (3.4 mL, 19.3 mmol) and Nal (2.63 g, 17.5 mmol) in DMF (20 mL) is stirred at 80° C. for 60 h and at 130° C. for another 5 h. The solvent is partially removed under reduced pressure, water is added and the mixture is extracted with ethyl acetate. Washing (brine) and drying (Na2SO4) of the combined organic extracts, filtration and evaporation of the solvent affords the crude product. The desired product is obtained by flash chromatography on silica gel (eluent: c-hexane/AcOEt 3:1). MS (LC-MS): 311.1 [M+H]+; tR (Zorbax SB C18 column, 10-95% CH3CN/H2O/0.8 min, 95% CH3CN/H2O, 0.7 min, CH3CN and H2O containing 0.1% TFA, flow: 1.5 mL/min): 1.20 min.

1. customThe solvent is partially removed under reduced pressure, water
2. additionis added
3. extractionthe mixture is extracted with ethyl acetate
4. washWashing (brine)
5. customdrying
6. filtration(Na2SO4) of the combined organic extracts, filtration and evaporation of the solvent
7. customaffords the crude product