[O:1]=[CH:2][C:3]1[CH:11]=[CH:10][C:7]([O:8][CH3:9])=[C:5]([OH:6])[CH:4]=1.C(=O)([O-])[O-].[K+].[K+].[CH3:18][O:19][CH2:20]Cl.O>CN(C)C=O>[CH3:9][O:8][C:7]1[CH:10]=[CH:11][C:3]([CH:2]=[O:1])=[CH:4][C:5]=1[O:6][CH2:18][O:19][CH3:20]To a solution of isovanillin (5.00 g, 32.9 mmol) in N,N-dimethylformamide (300 ml) were added potassium carbonate (5.00 g, 36.1 mmol) and chloromethyl methyl ether (2.91 g, 36.1 mmol), and the mixture was stirred for 4 hours at 50° C. The mixture was allowed to cool to room temperature, followed by addition of water. The mixture was extracted with ethyl acetate-toluene (3:1). The organic layer was washed with water and an aqueous saturated sodium chloride solution in the order, and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure and the residue was purified with silica gel chromatography (hexane:ethyl acetate=3:1) to give the subject compound (5.80 g, 89.9%).
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