Diisopropylcarbodiimide → 2-{2,6-dichloro-3-[(2,2-dimethyl-propionylamino)-methyl]-phenylamino}-6-(2,2-difluoro-ethoxy)-1H-benzimidazole-5-carboxylic acid

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A mixture of 2-(2,2-difluoro-ethoxy)-4,5-diamino-benzoic acid (732 mg, 3.15 mmol), N-(2,4-dichloro-3-isothiocyanato-benzyl)-2,2-dimethyl-propionamide (1.00 g, 3.15 mmol) and MeCN (15 mL) is stirred for 48 h, then BSTFA (1.03 mL, 3.15 mmol) is added and it is stirred at reflux for 10 min. Then DIC (0.494 mL, 3.15 mmol) is added and it is stirred for another 4 h. The mixture is cooled to rt, diluted with HOAc and concentrated. The residue is stirred with 1N NaOH, filtered and the filtrate is acidified with 4N HCl, extracted with EtOAc and purified via chromatography [DCM→DCM+10% EtOH/HOAc (95:5)] to give the subtitle compound.

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