Potassium Iodide → (E)-tert-butyl 3-(4-((6-((1,1-dioxido-3-oxobenzo[d]isothiazol-2(3H)-yl)methoxy)-2-(2-isopropylphenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylate

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To a solution of (E)-tert-butyl 3-(4-((6-hydroxy-2-(2-isopropylphenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylate (68 mg, 0.140 mmol) in acetone (2 mL) was added 2-(chloromethyl)benzo[d]isothiazol-3(2H)-one 1,1-dioxide (32.4 mg, 0.140 mmol), potassium carbonate (19.31 mg, 0.140 mmol) and potassium iodide (23.2 mg, 0.140 mmol). The resulting mixture was stirred at room temperature for 48 hours. The solvent was removed in vacuo. The resulting solid was retaken in ethyl acetate. The organic layer was washed with aqueous saturated ammonium chloride solution followed by brine. The organic layer was dried over anhydrous MgSO4 filtered and concentrated in vacuo to give the crude product, which was purified by flash chromatography (SiO2, 0-30% EtOAc/Heptane) to afford (E)-tert-butyl 3-(4-((6-((1,1-dioxido-3-oxobenzo[d]isothiazol-2(3H)-yl)methoxy)-2-(2-isopropylphenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylate (67.4 mg, 0.099 mmol, 71% yield). 1H NMR (400 MHz, (CD3)2SO) δ 8.37 (d, J=7.4 Hz, 1H), 8.18 (dd, J=7.4, 1.3 Hz, 1H), 8.11 (td, J=7.7, 1.3 Hz, 1H), 8.04 (t, J=7.6 Hz, 1H), 7.88 (d, J=2.2 Hz, 1H), 7.61-7.54 (m, 2H), 7.48-7.34 (m, 3H), 7.34-7.30 (m, 2H), 7.23-7.15 (m, 2H), 6.89-6.81 (m, 2H), 6.33 (d, J=16.0 Hz, 1H), 5.90 (s, 2H), 3.13 (q, J=6.9 Hz, 1H), 1.45 (s, 9H), 1.13 (d, J=6.8 Hz, 6H).

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