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With copper(l) iodide; 1,10-Phenanthroline; potassium carbonate; In N,N-dimethyl-formamide; at 140℃; for 24h;
General procedure: CuI (0.05 equiv), 1,10-phenanthroline (0.1 equiv) and K2CO3 (2 equiv) were placed in an oven-dried screw-capped test tube with Teflon-lined septum that was filled with nitrogen. About 2.5 mL of dry DMF was then added at room temperature. Now the corresponding aryl iodide (1.0 mmol) was added followed by MBI or FMBI (1.0 equiv) and the tube was placed in the preheated oil bath at 140 C and the reaction mixture was magnetically stirred for 22 h. After complete disappearance of iodobenzene (the progress of the reaction was followed by TLC), the reaction mixture was allowed to cool to room temperature. Then water was added and the reaction mixture was extracted with ethyl acetate. After removal of the solvent in vacuum, the crude residue was purified by column chromatography.5- (or 6-) (Difluoromethoxy)-2-(phenylsulfanyl)-1H-benzimidazole (1).
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