[C:1]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[S:12][CH:13]=[C:14]([CH:20]=[O:21])[C:15]=2[O:16][CH2:17][O:18][CH3:19])=[CH:7][CH:6]=1)([CH3:4])([CH3:3])[CH3:2].C(OCC)C.[CH:27]([Mg]Br)([CH3:29])[CH3:28].[Cl-].[NH4+]>C1COCC1>[C:1]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[S:12][CH:13]=[C:14]([CH:20]([OH:21])[CH:27]([CH3:29])[CH3:28])[C:15]=2[O:16][CH2:17][O:18][CH3:19])=[CH:7][CH:6]=1)([CH3:4])([CH3:2])[CH3:3]To a solution of 2-(4-t-butylphenyl)-3-methoxymethyloxy-4-formylthiophene (3.0 g, 10 mmol) in THF (2.5 mL), 2.0 M ethyl ether solution (6.0 mL, 12 mmol) of isopropylmagnesium bromide was added dropwise under cooling with ice, followed by stirring for 2.5 hours under cooling with ice. A saturated ammonium chloride aqueous solution was added to the reaction solution, and then extraction was carried out with ethyl acetate, and the organic layer was washed with a saturated sodium chloride solution and then dried over anhydrous sodium sulfate. The obtained organic layer was concentrated, and then purification was carried out with a silica gel column chromatography (n-hexane/ethyl acetate=3/1) to obtain the desired product as a pale yellow oil (1.18 g, yield 34%).
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