[C:1]([C:5]1[O:9][C:8]([CH3:10])=[C:7]([CH:11]=[O:12])[CH:6]=1)([CH3:4])([CH3:3])[CH3:2].[CH:13]1([Mg]Br)[CH2:18][CH2:17][CH2:16][CH2:15][CH2:14]1.O1CCCC1>>[C:1]([C:5]1[O:9][C:8]([CH3:10])=[C:7]([CH:11]([CH:13]2[CH2:18][CH2:17][CH2:16][CH2:15][CH2:14]2)[OH:12])[CH:6]=1)([CH3:4])([CH3:2])[CH3:3]An operation similar to that in Example 3 (2) was performed using 5-tert-butyl-2-methyl-3-furaldehyde (2.5 g) and 1N cyclohexylmagnesium bromide-tetrahydrofuran solution (23 mL) to give the title compound (2.3 g, 62%) as an oil.
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