Chlorosuccinimide → 4-(4-Chloro-5-(3-fluoro-4-methoxyphenyl)-1H-imidazol-1-yl)-N-(1,1-dimethylethyl)benzenesulfonamide

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Reaction Steps

A mixture of N-tert-butyl-4-[5-(3-fluoro-4-methoxyphenyl)imidazol-1-yl]benzenesulfonamide (41.40 g, 103 mmol, obtained in example 3) and acetonitrile (840 mL) is heated at reflux and acetonitrile is added until complete dissolution (200 mL more). Next, N-chlorosuccinimide (15.0 g, 113 mmol) is added and the mixture is refluxed for 24 h. The solvent is removed and the residue is suspended in EtOAc and 1N HCl and is stirred for 10 min. The solid obtained is filtered and washed directly in the filter with 1N HCl, 1N NaOH, saturated NH4Cl solution, H2O and Et2O. A solid is obtained, which is dried in vacuo to give 37.0 g of the product as a creamy solid (yield: 82%).

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