C[O:2][C:3]([C:5]1[CH:6]=[C:7]([F:14])[CH:8]=[C:9]2[S:13][CH:12]=[N:11][C:10]=12)=[O:4].[OH-].[Li+]>O1CCCC1>[F:14][C:7]1[CH:8]=[C:9]2[S:13][CH:12]=[N:11][C:10]2=[C:5]([C:3]([OH:4])=[O:2])[CH:6]=1To a solution of 6-fluoro-benzothiazole-4-carboxylic acid methyl ester (1.97 g, 9.33 mmol) in tetrahydrofuran (30 mL) was added aqueous lithium hydroxide solution (2M, 14.0 mL, 28 mmol, 3 eq.) and then stirred, at room temperature, for 4 hr. The reaction mixture was quenched with aqueous hydrochloric acid (2M, 30 mL) and stirred for 15 min. The resulting suspension was filtered and the solid produced was washed with water and air dried to give the title compound as a grey solid (1.51 g, 82%).
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