[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]COC)=[CH:7][CH:6]=1)([CH3:4])([CH3:3])[CH3:2].Cl.O>O1CCOCC1>[C:1]([C:5]1[CH:6]=[CH:7][C:8]([C:11]2[S:12][CH:13]=[C:14]([CH:20]=[O:21])[C:15]=2[OH:16])=[CH:9][CH:10]=1)([CH3:4])([CH3:2])[CH3:3]To 2-(4-t-butylphenyl)-3-methoxymethyloxy-4-formylthiophene (0.20 g, 0.66 mmol) in 1,4-dioxane (1.3 mL), 1 M hydrochloric acid (0.66 mL, 0.66 mmol) was added dropwise, and the reaction solution was stirred at 65° C. for 1 hour and at 80° C. for 1 hour. After addition of water, the reaction solution was extracted with ethyl acetate, and the organic layer was washed with saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, concentrated and purified by silica gel column chromatography (chloroform) to give the desired product as a reddish brown oil (0.12 g, yield 68%).
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