Eco‐friendly synthesis of 1,8‐dioxo‐octahydroxanthenes catalyzed by ionic liquid in aqueous media |
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| Authors: | Dong Fang Jin‐Ming Yang Zu‐Liang Liu |
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| Affiliation: | 1. Jiangsu Provincial Key Laboratory of Coast Wetland Bioresources & Environment Protection, Yancheng 224002, People's Republic of China;2. School of Chemistry and Chemical Engineering, Yancheng Normal University, Yancheng 224002, People's Republic of China |
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| Abstract: | A biodegradable functionalized ionic liquid 3‐(N,N‐dimethyldodecylammonium)propanesulfonic acid hydrogen sulfate ([DDPA][HSO4]) was prepared and used as a Brønsted acid–surfactant‐combined catalyst for the eco‐friendly one‐pot synthesis of 1,8‐dioxo‐octahydroxanthenes at 100°C in water. Under these conditions, the reaction of various aromatic aldehydes with dimedone generated 1,8‐dioxo‐octahydroxanthenes in good yields with a simple postreaction procedure. The products could simply be separated from the catalyst/water system, and the catalyst could be reused at least six times without noticeably decreasing the catalytic activity. J. Heterocyclic Chem., (2011). |
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