[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.Cl.C(OCC)C>C(OCC)(=O)C>[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]=1tert-Butyl 4-(4-phenyl-1,3-thiazol-2-yl)piperazine-1-carboxylate (691 mg, 2.00 mmol) was dissolved in ethyl acetate (50 ml), and a solution of 4 N hydrogen chloride in ethyl acetate (11 ml) was added thereto, followed by stirring at room temperature for 1 hour and half. Diethyl ether (20 ml) was poured to the reaction mixture, and a solid was separated by filtration, which was dissolved in an aqueous 1 N sodium hydroxide solution (7 ml). Water was poured to the reaction mixture, and the resulting solution was extracted with chloroform. The extract was washed with water and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to give 396 mg (80.8%) of the desired product as an oil.
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