[C:1]1([C:7]2[N:8]=[C:9]([N:12]3[CH2:17][CH2:16][N:15](C(OC(C)(C)C)=O)[CH2:14][CH2:13]3)[S:10][CH:11]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[ClH:25].C(OCC)C>C(OCC)(=O)C>[ClH:25].[ClH:25].[C:1]1([C:7]2[N:8]=[C:9]([N:12]3[CH2:17][CH2:16][NH:15][CH2:14][CH2:13]3)[S:10][CH:11]=2)[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1To a solution of tert-butyl 4-(4-phenyl-1,3-thiazol-2-yl)piperazine-1-carboxylate (1.25 g, 3.62 mmol) in ethyl acetate (20 ml) was added a solution of 4 N hydrogen chloride in ethyl acetate (20 ml), and the mixture was stirred at room temperature for 1 hour. To the reaction mixture was added diethyl ether (30 ml), and the desired product as a solid was separated by filtration, which was washed with diethyl ether to yield 1.06 g (92.2%) of the desired product.
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