Arylation N-heterocycles

C-N bonds are formed by cross-coupling of nitrogen heterocycles such as pyrazole, imidazole, pyrrole, triazole, or indole with aryl halides. The reaction is catalyzed by tris(acetylacetonato)iron and copper(II) oxide in the presence of cesium carbonate as base. A variety of N-arylated N-heterocycles is available by this method (Scheme 4-262). ... 

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