Trifluoroacetic acid → (3-{2-[2-(4-Chloro-phenoxy)-ethyl]-1,1-dioxo-1,2-dihydro-1lambda6-benzo[e][1,2,3]thiadiazin-4-yl}-5-fluoro-2-methyl-indol-1-yl)-acetic acid

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(3-{2-[2-(4-Chloro-phenoxy)-ethyl]-1,1-dioxo-1,2-dihydro-1λ6-benzo[e][1,2,3]thiadiazin-4-yl}-5-fluoro-2-methyl-indol-1-yl)-acetic acid tert-butyl ester (61 μmol) was treated with TFA (2 mL) for 2 hours, concentrated, and purified by preparative LCMS to give the title compound. 1H NMR (d6-DMSO) δ 8.11 (d, 1H), 7.92 (t, 1H), 7.83 (t, 1H), 7.46 (m, 2H), 7.24 (m, 2H), 6.95 (m, 4H), 4.52 (s, 2H), 4.39 (t, 2H), 4.27 (t, 2H), 2.20 (s, 3H) ppm. MS calculated for C26H21FClN3O5S—H: 540, observed: 540.

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