反应详情

To a stirred solution of 1H-benzoimidazole-4-carboxylic acid hydrochloride (2.0 g, 10.1 mmol), N,O-dimethylhydroxylamine hydrochloride (1.47 g, 15.1 mmol) and ethyldiisopropylamine (7.02 mL, 40.3 mmol) in DMF (10 mL) at room temperature was added O-benzotriazole-N,N,N′,N′-tetramethyl-uronium-hexafluoro-phosphate (3.90 g, 10.3 mmol) in a single portion. The mixture was stirred at room temperature overnight then concentrated in vacuo. Purification by SiO2 chromatography followed by trituration with EtOAc provided 1H-benzoimidazole-4-carboxylic acid methoxy-methyl-amide (945 mg).

1. concentrationthen concentrated in vacuo
2. customPurification by SiO2 chromatography