Synthesis of 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthene-11-ones catalyzed by biodegradable ionic liquid
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A biodegradable acyclic SO3H-functionalized ionic liquid has been used as a novel catalyst for the synthesis of 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthene-11-ones via one-pot multi-component condensation of β-naphthol, aromatic aldehydes, and cyclic 1,3-dicarbonyl compounds, under solvent-free conditions, to afford good to excellent yields ranging from 85 to 93 % within 30–60 min. After the reaction the products could be simply separated from the reaction mixture and the catalyst could be recycled and reused several times without noticeable reduction of catalytic activity.
KeywordsXanthene Synthesis Biodegradable ionic liquid Solvent-free Multi-component reaction
We express our sincere thanks to the Ministry of Science and Technology of the P.R. China (11C26213201395), Jiangsu Provincial Department of Education (JHB2011-52), and the Key Laboratory of Organic Synthesis of Jiangsu Province (KJS1112) for financial assistance.
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