反应详情

In an analogous manner as described in example 29, 5-[4,5-bis-(4-chloro-phenyl)-4,5-dihydro-1H-imidazol-2-yl]-2-chloro-4-ethoxy-N-methyl-benzenesulfonamide was treated with phosgene and diisopropylethylamine in methylene chloride to give 2-(4-chloro-2-ethoxy-5-methylsulfamoyl-phenyl)-4,5-bis-(4-chloro-phenyl)-4,5-dihydro-imidazole-1-carbonyl chloride. The crude carbamoyl chloride was then reacted with 1-hydroxybenzotriazole hydrate and diisopropylethylamine in methylene chloride to give the racemic 2-(4-chloro-2-ethoxy-5-methylsulfamoyl-phenyl)-4,5-bis-(4-chloro-phenyl)-4,5-dihydro-imidazole-1-carboxylic acid benzotriazol-1-yl ester after purification by flash column chromatography (silica gel, eluting with a gradient of ethyl acetate in hexanes).