反应详情

1-Ethyl-2-(6-trifluoromethoxy-benzothiazol-2-ylamino)-1H-benzoimidazole-5-carboxylic acid (2.1 g) was prepared by following General Procedure E starting from 1-ethyl-2-(6-trifluoromethoxy-benzothiazol-2-ylamino)-1H-benzoimidazole-5-carboxylic acid methyl ester (3.5 g) and sodium hydroxide (2.0 N solution, 8.0 mL). LCMS: m/z 424; and 1H NMR (DMSO-d6, 400 MHz): δ 8.17 (1H, m), 7.96 (1H, m), 7.75 (1H, m), 7.88-7.85 (1H, m), 7.65-7.63 (1H, m), 7.59-7.57 (1H, m), 7.40-7.37 (1H, m), 4.26-4.25 (2H, q), 1.35-1.32 (3H, t) —COOH proton signal was not observed.