反应详情

The procedure as in Example 1: step c was followed using 5-amino-4-(3-bromo-benzenesulfonyl)-thiophene-2-carboxylic acid methyl ester (754.2 mg, 2 mmol, Example 20: step e), 3-formyl phenyl boronic acid (599.7 mg, 4 mmol), Pd(PPh3)4 (462.2 mg, 0.4 mmol), aqueous Na2CO3 (2M, 8 mL, 16 mmol), ethanol (8 mL) and toluene (16 mL). Purification by flash column chromatography (Biotage Flash™ System—40 M SiO2 column) (25% EtOAc in hexanes) of the residue yielded the title compound (317 mg, 40%) as a brown solid. 1H-NMR (CDCl3): δ 10.10 (s, 1H), 8.10–8.17 (m, 2H), 7.92–7.95 (m, 2H), 7.82–7.89 (t, 2H, J=8.1 Hz), 7.58–7.70 (m, 3H), 6.05 (br s, 2H), 3.80 (s, 3H).

1. customPurification by flash column chromatography (Biotage Flash™ System—40 M SiO2 column) (25% EtOAc in hexanes) of the residue