[CH2:1]([O:3][C:4]1[CH:5]=[C:6]([O:24][C:25]2[CH:26]=[N:27][C:28]([S:31]([CH3:34])(=[O:33])=[O:32])=[CH:29][CH:30]=2)[CH:7]=[C:8]2[C:12]=1[NH:11][C:10]([C:13]1[S:14][CH:15]([CH2:18][C:19]([O:21]CC)=[O:20])[CH2:16][N:17]=1)=[CH:9]2)[CH3:2].O1CCCC1.CO.[OH-].[K+]>O>[CH2:1]([O:3][C:4]1[CH:5]=[C:6]([O:24][C:25]2[CH:26]=[N:27][C:28]([S:31]([CH3:34])(=[O:33])=[O:32])=[CH:29][CH:30]=2)[CH:7]=[C:8]2[C:12]=1[NH:11][C:10]([C:13]1[S:14][CH:15]([CH2:18][C:19]([OH:21])=[O:20])[CH2:16][N:17]=1)=[CH:9]2)[CH3:2]To a mixture of ethyl [2-(7-ethoxy-5-{[6-(methylsulfonyl)pyridin-3-yl]oxy}-1H-indol-2-yl)-4,5-dihydro-1,3-thiazol-5-yl]acetate (0.22 g), tetrahydrofuran (10 mL) and methanol (10 mL) was added a solution of potassium hydroxide (85%, 0.10 g) in water (5 mL). The mixture was stirred at room temperature for 15 h and then partitioned between ethyl acetate and aqueous citric acid solution. The organic layer was washed with brine, dried (MgSO4), filtered, and concentrated to give a light yellow amorphous solid, which was crystallized from ethyl acetate-hexane to give the title compound (186 mg, 90%) as light yellow crystals. MS 476 (MH+). mp 208-210° C.
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