Abstract
The Cu dispersed on mesoporous SBA-15 has demonstrated the regioselective CH bond C3-cyanation of indoles by in-situ generation of CN using DMF and NH4I in presence of O2. Pyridine adsorbed diffuse reflectance infrared spectroscopy (DRIFTS) results revealed that surface Cu2+ species are acting as Lewis acid sites in the in-situ generation of cyano- group for the synthesis of indole nitriles. A direct correlation between Cu metal surface area and the indole nitrile yields are established and the dual role of copper is substantiated by N2O titration and XPS techniques. The 10wt%Cu/SBA-15 demonstrated superior performance when compared to Pd, Ru supported on SBA-15. The 10wt%Cu/SBA-15 catalyst showed consistent activity and selectivity after the 4th cycle.
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