[NH2:1][C:2]1[CH:7]=[C:6]([C:8]2[S:12][C:11]([CH2:13][C:14]([O:16]CC)=[O:15])=[N:10][C:9]=2[C:19]2[CH:24]=[CH:23][CH:22]=[C:21]([CH3:25])[CH:20]=2)[CH:5]=[CH:4][N:3]=1.[OH-].[Na+].Cl>C(O)C>[NH2:1][C:2]1[CH:7]=[C:6]([C:8]2[S:12][C:11]([CH2:13][C:14]([OH:16])=[O:15])=[N:10][C:9]=2[C:19]2[CH:24]=[CH:23][CH:22]=[C:21]([CH3:25])[CH:20]=2)[CH:5]=[CH:4][N:3]=1To a suspension of ethyl [5-(2-amino-4-pyridyl)-4-(3-methylphenyl)-1,3-thiazol-2-yl]acetate (7.00 g, 19.8 mmol) in ethanol (40 mL) was added a 1N aqueous sodium hydroxide solution (40 mL), and the mixture was stirred for 2 hours at the room temperature under the same condition, The reaction mixture was neutralized with 2N hydrochloric acid (20 mL), then, the produced solid was collected by filtration. The crude product was washed with water, and dried to obtain a title compound (6.10 g, yield: 95%).
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