4-Acetylbenzenesulphonamide → 2-{5-Methoxy-2-[3-oxo-3-(4-aminosulfonyl-phenyl)-E-propenyl]-4-thiophen-2-yl-phenoxy}-2-methyl-propionic acid

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The title compound was prepared by condensing 4-acetyl-benzenesulfonamide (Ex-26A) and 2-(2-formyl-5-methoxy-4-thiophen-2-yl-phenoxy)-2-methyl-propionic acid (Ex-59B) in a similar manner as described in Ex-22. Yellow solid, mp 164–165° C., 85% yield. 1H-NMR (300 MHz, DMSO-d6) δ 8.21–8.28 (m, 3H), 7.96–8.12 (m, 4H), 7.67 (d, 1H, J=3.0 Hz), 7.56 (brs, 3.0H), 7.14 (dd, 1H, J=5.7, 3.0 Hz), 6.57 (s, 1H), 3.88 (s, 3H), 1.66 (s, 6H). MS (ESI) m/z=502 ([M+H]+, 100%). Anal. Calcd. for C24H23NO7S2: C, 57.47; H, 4.62; N, 2.79; S, 12.79. Found: C, 57.70; H, 4.74; N, 2.85; S, 12.51.

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