Silica iodide proves to be an excellent catalyst for the Hantzsch‐type four component synthesis of hydroquinolines under mild, solvent‐free conditions.

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Formic acid catalyzed, single step and environmentally friendly process for synthesis of 3, 3-diheteroaromatic oxindole derivatives is described. This adopted protocol for Friedel-Crafts substitution reaction has the advantage of reusability of the catalyst, high yields and ease of separation of pure products.