Abstract :
Para-toluene sulfonic acid embedded on nano silica )ρ-TSA@nano SiO2( has been synthesized via a simple procedure and characterized by fourier transform infrared spectroscopy (FT-IR), energy-dispersive X-ray spectroscopy (EDX), and scanning electron microscopy (SEM) techniques. The synthesized nanocatalyst has been utilized to accelerate the one-pot multicomponent condensation reaction of isatins, anilines, and acetone to obtain the corresponding 1'-aryl-2'-(2-oxoindolin-3-yl)spiro[indoline-3,5'-pyrroline]-2,3'-diones at water media under reflux conditions. Utilization of H2O as available and green solvent, excellent yields of products, short reaction times, avoidance of by-products which could be obtained via Aldol condensation of acetone, easily-handle, inexpensive, non-toxic, and heterogeneous nano acid catalyst are some advantageous of the reported method. The recovery and reusability of the nano catalyst has been examined for four runs without activity loss
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