反应详情

To a solution of methyl 6-chloro-5-(cyclopropylcarbamoyl)-1H-benzimidazole-2-carboxylate (2.1 g, 7.2 mmol) in tetrahydrofuran (50 ml) was added dropwise, at 0° C., a solution of lithium hydroxide monohydrate (0.6 g, 14.3 mmol) in water (25 ml). The reaction mixture was stirred at this temperature for 14 h. After removing the tetrahydrofuran under reduced pressure, the aqueous solution was acidified with hydrochloric acid (2 M). The precipitated solid was filtered off with suction. 1.7 g (81% of theory) of 6-chloro-5-(cyclopropylcarbamoyl)-1H-benzimidazole-2-carboxylic acid were obtained.

1. customAfter removing the tetrahydrofuran under reduced pressure
2. filtrationThe precipitated solid was filtered off with suction