Abstract
Sulfuric acid ([3‐(3‐silicapropyl)sulfanyl]propyl]ester (SASPSPE) is used as a recyclable catalyst for the synthesis of 1,2,4,5‐tetrasubstituted imidazoles. A range of various polysubstituted imidazoles was synthesized via four‐component condensation of benzil, aldehydes, amines, and ammonium acetate in the presence of SASPSPE under solvent‐free conditions at 140°C. The heterogeneous catalyst was recycled for five runs on the reaction of benzil, 4‐methylbenzaldehyde, benzyl amine, and ammonium acetate without losing its catalytic activity.
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