C([O:3][C:4]([C:6]1[N:7]=[C:8]([C:11]2[CH:16]=[CH:15][C:14]([O:17][CH3:18])=[CH:13][CH:12]=2)[S:9][CH:10]=1)=[O:5])C.O.[OH-].[Li+].O.[ClH:23]>C1COCC1>[CH3:18][O:17][C:14]1[CH:13]=[CH:12][C:11]([C:8]2[S:9][CH:10]=[C:6]([C:4]([OH:5])=[O:3])[N:7]=2)=[CH:16][CH:15]=1.[Cl-:23].[NH4+:7]A mixture of 2-(4-Methoxy-phenyl)-thiazole-4-carboxylic acid ethyl ester and lithium hydroxide monohydrate (2.0 mmol, 84 mg) was diluted with a 2:1 mixture of THF:H2O (6 mL), and the resulting reaction was allowed to stir at room temperature for about 15 hours. The reaction mixture was then acidified using aqueous HCl (1 M, 10 mL), then dried via lyophilization to provide 2-(4-Methoxy-phenyl)-thiazole-4-carboxylic acid as an ammonium chloride salt. HPLC-MS RT. 1.37 minutes; mass calculated for formula C11H9NO3S 235.03, observed LCMS m/z 236.10 (M+H).
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