SBA-15-functionalized melamine-pyridine group-supported palladium(0) as an efficient heterogeneous and recyclable nanocatalyst for N-arylation of indoles through Ullmann-type coupling reactions

SBA-15-functionalized melamine-pyridine group-supported palladium(0) was found to serve as a heterogeneous and recyclable nanocatalyst for N-arylation of indoles with aryl iodides under a low catalyst loading (0.3mol% of Pd) through Ullmann-type CN coupling reactions. A variety of aryl iodides could be aminated to provide the N-arylated products in good to excellent yields without the need of an inert atmosphere. Also, this catalyst was found to be an efficient system for the N-arylation of other nitrogen-containing heterocycles with aryl iodides. The heterogeneous palladium catalyst could be recovered by simple filtration of the reaction solution and reused for six cycles without significant loss in its activity. Copyright (c) 2015 John Wiley & Sons, Ltd.