[C:1]([C:3]1[C:4]([I:15])=[C:5]([C:10]([O:12][CH2:13][CH3:14])=[O:11])[S:6][C:7]=1SC)#[N:2].[CH:16]1C=C(Cl)C=C(C(OO)=O)C=1.[S:27]([O-:30])([O-])=[O:28].[Na+].[Na+].C(=O)([O-])[O-].[K+].[K+]>C(Cl)Cl.C1COCC1>[I:15][C:4]1[C:3]([C:1]#[N:2])=[C:7]([S:27]([CH3:16])(=[O:30])=[O:28])[S:6][C:5]=1[C:10]([O:12][CH2:13][CH3:14])=[O:11]Ethyl 4-cyano-3-iodo-5-(methylsulfanyl)thiophene-2-carboxylate (7.2 g, 20.4 mmol) was dissolved in DCM (200 mL) and THF (100 mL) and m-CPBA (9.14 g, 40.8 mmol) was added. The reaction mixture was stirred at rt overnight. Sodium sulfite (5.14 g, 40.8 mmol) was added, stirred for 10 minutes followed by addition of potassium carbonate (8.45, 61.2 mmol). The suspension was stirred at rt for 1 hour and filtered through celite, washed with DCM and the solvent was evaporated to afford ethyl 3-iodo-4-cyano-5-(methylsulfonyl)thiophene-2-carboxylate (6.80 g, 78%). LCMS: (FA) ES+ 386. 1H NMR (400 MHz, d1-chloroform) δ: 4.45 (q, 2H), 3.38 (s, 3H), 1.43 (t, 3H).
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