[Cl:1][C:2]1[CH:3]=[C:4]([C:7](=O)[CH3:8])[S:5][CH:6]=1.O.[NH2:11][C:12]([NH2:14])=[S:13]>C(OCC)C.BrBr.CCO>[NH2:14][C:12]1[S:13][CH:8]=[C:7]([C:4]2[S:5][CH:6]=[C:2]([Cl:1])[CH:3]=2)[N:11]=1To a solution of 4.18 g of 4-chloro-2-acetylthiophene in 30 ml of diethylether, 1.5 ml of bromine was added under ice cooling, and the mixture was stirred at room temperature for 2 hours. Water was added to the reaction solution, and the organic phase was extracted. The obtained organic layer was washed with brine and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure to obtain brominated compound. To a solution of the brominated compound in 30 ml of EtOH, 2.1 g of thiourea was added at room temperature, and the mixture was stirred at 80° C. overnight. The precipitate was filtered, and obtained solution was evaporated under reduced pressure. Chloroform was added and then an organic layer was washed with aqueous potassium carbonate and brine, and dried over sodium sulfate. The residue obtained by the evaporation of the solvent under reduced pressure was washed with hexane:EtOAc=1:1 to obtain 2.57 g of 2-amino-4-(4-chlorothiophen-2-yl)thiazole.
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