[N:1]1([C:7]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8])[CH2:6][CH2:5][NH:4][CH2:3][CH2:2]1.[CH2:14]([O:16][C:17]([C:19]1[N:20]=[C:21]([CH2:24]Cl)[S:22][CH:23]=1)=[O:18])[CH3:15].C(=O)([O-])[O-].[K+].[K+].[I-].[Na+]>C(#N)C>[C:10]([O:9][C:7]([N:1]1[CH2:6][CH2:5][N:4]([CH2:24][C:21]2[S:22][CH:23]=[C:19]([C:17]([O:16][CH2:14][CH3:15])=[O:18])[N:20]=2)[CH2:3][CH2:2]1)=[O:8])([CH3:13])([CH3:12])[CH3:11]tert-Butyl 1-piperazinecarboxylate (1.811 g, 9.72 mmol), 2-chloromethyl-thiazole-4-carboxylic acid ethyl ester (2 g, 9.72 mmol), potassium carbonate (2.69 g, 19.45 mmol) and sodium iodide (0.292 g, 1.945 mmol) were combined and stirred in acetonitrile at reflux for 2 hours. The reaction was concentrated under reduced pressure. The residue was taken up in dichloromethane and filtered. The filtrate was concentrated under reduced pressure to give the title compound (4.38 g).
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