4-Acetylbenzoic Acid → 2-{5-[3-(4-Carboxy-phenyl)-3-oxo-E-propenyl]-2,4-dimethoxy-phenyl}-pyrrole-1-carboxylic acid tert-butyl ester

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The title compound was prepared by condensing 2-(5-formyl-2,4-dimethoxy-phenyl)-pyrrole-1-carboxylic acid tert-butyl ester (Ex-57A) and 4-acetylbenzoic acid in a similar manner as described in Ex-3. Yellow solid, mp 205–207° C., 6% yield. 1H-NMR (DMSO-d6) δ 8.19 (d, J=5 Hz, 2H), 8.00–8.10 (m, 3H), 7.87 (s, 1H), 7.80 (d, J=16 Hz, 1H), 7.27–7.28 (m, 1H), 6.71 (s, 1H), 6.22–6.23 (m, 1H), 6.14–6.16 (m, 1H), 3.96 (s, 3H), 3.79 (s, 3H), 1.29 (s, 9H). MS m/z=476 ([M−H]+). HMRS (EI) calcd. for C27H27NO7: 477.1788; found: 477.1793.

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