[CH:1]([C:3]1[O:7][C:6]([C:8]([OH:10])=[O:9])=[CH:5][CH:4]=1)=[O:2].C(N(CC)CC)C.ClC(OCC)=O.[CH2:24](O)[C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1>O1CCCC1.O>[CH2:24]([O:9][C:8]([C:6]1[O:7][C:3]([CH:1]=[O:2])=[CH:4][CH:5]=1)=[O:10])[C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1500 mg of 5-formylfuran-2-carboxylic acid was dissolved in 10 mL of tetrahydrofuran, added with 990 μl of triethylamine, cooled to 0° C., and then added with 374 μl of ethyl chloroformate. After stirring at this temperature for 30 minutes, 406 μl of benzylalcohol was added and stirred at room temperature overnight. Adding water to stop the reaction, the solution was extracted with ethyl acetate. The organic phase was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated, and purified by silica gel column chromatography, to afford 508 mg of the title compound as white crystals.
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