[Br:1][C:2]1[S:6][C:5]([C:7]([O:9]CC)=[O:8])=[C:4]([C:12]2[CH:17]=[CH:16][C:15]([Cl:18])=[CH:14][C:13]=2[Cl:19])[C:3]=1[C:20]#[N:21].O.[OH-].[Na+]>O1CCCC1>[Br:1][C:2]1[S:6][C:5]([C:7]([OH:9])=[O:8])=[C:4]([C:12]2[CH:17]=[CH:16][C:15]([Cl:18])=[CH:14][C:13]=2[Cl:19])[C:3]=1[C:20]#[N:21]Ethyl 5-bromo-4-cyano-3-(2,4-dichlorophenyl)thiophene-2-carboxylate (4.60 g, 0.0114 mol) was dissolved in Tetrahydrofuran (100 mL) and Water (20 mL) and 1.00 M of Sodium hydroxide in Water (34.1 mL, 0.0341 mol) was added The mixture was stirred at room temperature overnight. Reaction was quenched by addition of 1N HCl (36 mL), extracted with EA (3×), dried MgSO4, filtered and evaporated to give the product that was used without further purification (4.28 g, 100%). LCMS: (FA) ES−, 374, 376, 378. 1H NMR (400 MHz, d1-chloroform) δ: 7.52 (d, J=1.99 Hz, 1H), 7.35 (dd, J=8.28, 2.02 Hz, 1H), 7.21 (d, J=8.27 Hz, 1H).
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