Acetic Acid → 6-Benzenesulfonylcarbamoyl-1-(biphenyl-4-ylmethyl)-2-carboxybenzimidazole

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Reaction Steps

Triethylamine (0.080 g) and 0.148 g of methyloxalyl chloride were added to a solution of 0.400 g of N-benzenesulfonyl-4-amino-3-(biphenyl-4-ylmethylamino)benzamide in 3 ml of N,N-dimethylformamide, and the mixture was stirred at room temperature for 2 hours. The reaction solution was concentrated, and the residue was purified through silica-gel column chromatography (eluent: a mixture of ethyl acetate and methanol at a ratio of 9:1) to obtain crude 6-benzenesulfonylcarbamoyl-1-(biphenyl-4-ylmethyl)-2-carboxybenzimidazole. This compound was dissolved in 1 ml of acetic acid and 5 ml of methanol, and the mixture was stirred at 60° C. for 15 hours. The reaction solution was neutralized with a potassium hydroxide aqueous solution. The crystals precipitated were separated through filtration, and were dried to give 0.245 g of 6-benzenesulfonylcarbamoyl-1-(biphenyl-4-ylmethyl)-2-carboxybenzimidazole (229).

Provenance & Evidence