反应详情

Commercially available 1-(4-methylphenyl)-1-cyclopropane carboxylic acid is treated with nitronium tetrafluoroborate in sulfolane to afford 1-(4-methyl-3-nitrophenyl)-1-cyclopropane carboxylic acid. This is converted to 1-(4-methyl-3-nitrophenyl)-1-bromocyclopropane by treatment with mercuric oxide and bromine in methylene chloride. Reduction with zinc dust in the presence of calcium chloride in aqueous ethanol affords 5-cyciopropyl-2-methylaniline. Conversion to 4-cyclopropyl-5-(2-imidazolinylamino)-7-methylbenzimidazole is completed in the same manner as 4-ethyl-5-(2-imidazolinylamino)-7-methylbenzimidazole (see Example 2).