Hydrochloric Acid → 3-{3-[(Dibenzofuran-2-carbonyl)-amino]phenyl}-acrylic acid

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The ester (19) (46 mg, 0.12 mmol) was hydrolysed using Method C, except that MeOH (1 mL) and THF (1 mL) were used, and the reaction mixture was heated to 40° C. for 1 hour. After the reaction, TBME was added and the mixture acidified using 6N HCl. The aqueous was extracted with more TBME (×3), EtOAc (×3), dried (MgSO4) and the solvent concentrated in vacuo. The crude solid was triturated with DCM, filtered, washed with heptane and dried to give the title compound. Yield: 34 mg, 81%; LC-MS tr 2.08 min; HPLC Purity: 100%; MS (ES+) m/z 358 (M+H); 1H NMR (400 MHz; DMSO): δ 6.60 (d, 1H), 7.55-7.75 (m, 5H), 7.9 (d, 1H), 7.95-8.05 (m, 2H), 8.25 (s, 1H), 8.30 (d, 1H), 8.40 (d, 1H), 8.95 (s, 1H), 10.65 (s, 1H)

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