Potassium Carbonate → Benzimidazole

Beteiligte Stoffe

Reaktionsschritte

2.83 Grams of a 2-cyanobenzimidazole compound compound (i)]of the formula (II) in which X is H and Z is OCF2CFHO was dissolved in 50 ml of acetonitrile. 3.8 Grams of potassium carbonate was added thereto. The resulting mixture was heated under reflux for 15 minutes. Thereafter, 2.6 g of dimethylsulfamoyl chloride was added to the refluxed mixture. Refluxing was continued for additional 40 minutes with heating. The reaction solution was poured into ice water and extracted with ethyl acetate. The organic layer was washed with water and dried over anhydrous sodium sulfate. A residue was obtained by removing the solvent from the dried layer by distillation. Column chromatographying the residue on silica gel with toluene as an eluent gave 1.53 g of a benzimidazole derivative present compound (1)] of the formula (I) in which X is H, Z is OCF2CFHO, R is CN and Q is N(CH3)2.

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