Ammonia methanol → 3-{3-[4-(2,3,6-Trifluorobenzylsulfamoyl)-phenyl]-ureido}-benzamidine

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Reaction Steps

3-{3-[4-(2,3,6-Trifluorobenzylsulfamoyl)-phenyl]-ureido}-benzimidic acid methyl ester (250 mg, 0.5 mmol) was dissolved in NH3/MeOH (15 ml, 7 M). The solution was stirred overnight at rt. Further 10 ml of NH3/MeOH (7 M) were added and the mixture stirred for 3 h at 65° C. The solvents were evaporated and the solid residue purified by flash chromatography on silica gel with a gradient of AcOEt and MeOH. The fractions with the desired product were collected, evaporated and the product crystallized from MeOH/Et2O. Yield 50%.

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