Abstract
3‐Methyl‐1‐sulfonic acid imidazolium hydrogen sulfate ([MSIm][HSO4]) catalyzed the condensation of 5‐aminobenzotriazole and 5,5‐dimethyl‐cyclohexane‐1,3‐dione (dimedone) with aromatic aldehydes under microwave irradiation. This method is efficient to synthesize 11‐aryl‐8,8‐dimethyl‐6,7,9,11‐tetrahydro[1,2,3]triazolo[4,5‐a]acridine‐10(1H)‐one derivatives as a series of tetrahydroacridines in good to excellent yields, while the catalyst can be recovered and reused up to six times without significant loss of activity. This one‐pot three‐component reaction provided an efficient method for the synthesis of aromatic heterocycles.
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