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[摘要]：Silica-bonded S-sulfonic acid (SBSSA) has been found to be an efficient catalyst for the synthesis of 1,8-dioxo-decahydroacridines and 1,8-dioxo-octahydroxanthenes in excellent yields. The former have been synthesized from aromatic aldehydes, amines, and 5,5-dimethyl-1,3-cyclohexanedione, whereas the latter from this mixture without amines. The method is an easy access to functionalized acridine and xanthene derivatives. The catalyst can be reused. |
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