Kaolin/KOH Is an Efficient Heterogeneous Catalyst for the Synthesis of 3-Hydroxy-3-indolyl Oxindoles

3-Hydroxy-3-indolyl oxindoles were synthesized from isatins and indoles in good to excellent yields by using heterogeneous catalyst kaolin preloaded with KOH.

Keywords: Heterogeneous catalyst, indole, isatin, kaolin/KOH

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ACKNOWLEDGMENTS

We thank Dr. J. S. Yadav (director) and Dr. V. V. N. Reddy (head of department) of the Indian Institute of Chemical Technology, Hyderabad, for constant encouragement and financial support.