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A TiO 2 –SiO 2  nanocomposite catalyzes the one-pot cyclocondensation reaction of 1 H -indole-2,3-diones (isatins), 1,3-cyclohexanediones, and urea at  T  = 70°C under solvent-free conditions with high efficiency. The present method affords the corresponding spiro products in high yields and short reaction time. The unique features of the TiO 2 –SiO 2  nanocomposite are high catalytic activity, ease of preparation, non-toxicity, low loading, and recyclability.

TiO 2 –SiO 2 nanocomposite as a highly efficient catalyst for the solvent-free cyclocondensation reaction of isatins, cyclohexanones, and urea