[OH:1][C:2]1[CH:7]=[C:6]([CH3:8])[C:5]([C:9]2[CH:14]=[CH:13][CH:12]=[C:11]([CH:15]=[O:16])[CH:10]=2)=[C:4]([CH3:17])[CH:3]=1.[CH3:18][O:19][CH2:20]Cl.C(=O)([O-])[O-].[K+].[K+].[I-].[K+]>CN(C)C=O.C(OCC)(=O)C>[CH3:18][O:19][CH2:20][O:1][C:2]1[CH:7]=[C:6]([CH3:8])[C:5]([C:9]2[CH:14]=[CH:13][CH:12]=[C:11]([CH:15]=[O:16])[CH:10]=2)=[C:4]([CH3:17])[CH:3]=1
A mixture of 4′-hydroxy-2′,6′-dimethylbiphenyl-3-carbaldehyde (4.5 g, 19.9 mmol), chloromethyl methyl ether (2.3 mL, 30.3 mmol), potassium carbonate (5.5 g, 39.8 mmol) and potassium iodide (0.66 g, 3.98 mmol) in N,N-dimethylformamide (50 mL) was stirred at 70° C. for 20 hrs. The reaction solution was diluted with ethyl acetate, washed successively with aqueous citric acid solution, water and saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (ethyl acetate:hexane=3:97-1:9) to give the title compound (1.7 g, yield 32%) as a colorless oil.
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