[CH3:1][O:2][C:3]1[CH:4]=[CH:5][C:6]2[O:10][C:9]([CH:11]=[O:12])=[C:8]([CH3:13])[C:7]=2[CH:14]=1.[CH2:15]([Mg]Br)[CH:16]([CH3:18])[CH3:17].[Cl-].[NH4+]>O1CCCC1>[CH3:1][O:2][C:3]1[CH:4]=[CH:5][C:6]2[O:10][C:9]([CH:11]([OH:12])[CH2:15][CH:16]([CH3:18])[CH3:17])=[C:8]([CH3:13])[C:7]=2[CH:14]=1To a solution (4.0 mL) of 5-methoxy-3-methyl-1-benzofuran-2-carbaldehyde (1.91 g) synthesized in Example A27(2) in tetrahydrofuran was added a solution (15.0 mL) of 1.0M isobutylmagnesium bromide in tetrahydrofuran at 0° C., and the mixture was stirred for 1 hr. Saturated aqueous ammonium chloride solution was added to quench the reaction, tetrahydrofuran was evaporated in an evaporator, and the residue was extracted with ethyl acetate. The extract was washed with saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (20% ethyl acetate/hexane) to give the title object compound (1.53 g, 62%) as a yellow oil.
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