N-arylation of indoles with aryl halides using copper/glycerol as a mild and highly efficient recyclable catalytic system.

Highlights: [•] Glycerol as a green, environmentally benign, safe, and nontoxic reaction media. [•] Variety of aryl halides gave corresponding N-aryl heterocycles using CuI catalyst. [•] The copper/glycerol catalytic system was efficiently recycled up to four runs. [Copyright &y& Elsevier]