for the rapid synthesis of 3,3′-Diindolylmethanes (DIMs) via coppercatalyzed Friedel-Crafts alkylation of indoles in 25 min has been developed. This protocol also has the advantage of H2O as a by-product, room temperature and air condition, prefunctionalization-free of indoles, good C-3 selectivity of indoles, broad substrate scope, good reactivity (TON of up to 19.6, TOF of 972 h-1) and excellent to