[CH2:1]([O:3][C:4]([C:6]1[S:10][C:9]([CH3:11])=[N:8][C:7]=1OS(C1C=CC(C)=CC=1)(=O)=O)=[O:5])[CH3:2].[CH2:23]([NH2:30])[C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1>O1CCOCC1>[CH2:1]([O:3][C:4]([C:6]1[S:10][C:9]([CH3:11])=[N:8][C:7]=1[NH:30][CH2:23][C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)=[O:5])[CH3:2]To a solution of 2-methyl-4-(toluene-4-sulfonyloxy)-thiazole-5-carboxylic acid ethyl ester (2.0 g, 5.865 mmol) in 1,4-dioxane (50 mL) was added benzylamine (1.92 mL, 17.6 mmol) and the mixture was heated at 120° C. for 6 h. The reaction mixture was cooled to RT and partitioned between EtOAc and an aqueous solution of HCl (1 M). The organic layer was isolated, washed with brine, then dried (MgSO4) and concentrated in vacuo. The resultant residue was purified by column chromatography to give the title compound as a yellow solid (0.80 g, 49%).
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