[C:1]([C:5]1[N:6]=[C:7]([C:10]2[O:11][C:12]3[CH:18]=[CH:17][C:16]([O:19]C)=[CH:15][C:13]=3[CH:14]=2)[S:8][CH:9]=1)([CH3:4])([CH3:3])[CH3:2].B(Br)(Br)Br.C(=O)([O-])O.[Na+]>ClCCl>[C:1]([C:5]1[N:6]=[C:7]([C:10]2[O:11][C:12]3[CH:18]=[CH:17][C:16]([OH:19])=[CH:15][C:13]=3[CH:14]=2)[S:8][CH:9]=1)([CH3:4])([CH3:2])[CH3:3]To a cooled solution of 4-tert-butyl-2-(5-methoxybenzofuran-2-yl)thiazole (1.0 g) in dichloromethane (10 ml), 1M solution of boron tribromide in dichloromethane (7 ml) was added dropwise at 5° C. After being stirred for 3 hours, the resulting solution was poured into a mixture of ice and aqueous sodium hydrogen carbonate. The resulting precipitates were collected by filtration and dissolved in a mixture of tetrahydrofuran and water. The solution was concentrated to give crystals of 4-tert-butyl-2-(5-hydroxybenzofuran-2-yl)thiazole (0.91 g).
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