Abstract
Abstract The heterogeneous N-arylation reaction of indoles with aryl halides was achieved in toluene at 110 °C by using 4 mol % MCM-41-immobilized bidentate nitrogen copper(I) complex [MCM-41–2N-CuI] as catalyst and K 3 PO 4 as base, yielding a variety of N -arylindoles in good to excellent yields. The heterogeneous copper catalyst exhibited as high activity as homogeneous CuI/diamine catalytic system and can be easily prepared by a simple two-step procedure from commercially available and cheap reagents and recovered by a simple filtration of the reaction solution and reused for 10 cycles with almost consistent activity.
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