Chitosan-encapsulated manganese ferrite particles bearing sulfonic acid group catalyzed efficient synthesis of spiro indenoquinoxalines |
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Authors: | Sepideh Lahouti Hossein Naeimi |
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Institution: | Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan Iran, Fax: +98 591 2397, +98 591 2388 |
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Abstract: | A simple, highly versatile and efficient synthesis of 5-phenyl-spirodiindenopyridine-indenoquinoxaline]-diones is achieved through a four-component one pot reaction of ninhydrin, 1,2-diaminobenzene, 1,3-indandione and aniline. This reaction was catalyzed by MnFe2O4@CS-Bu-SO3H MNPs as a very efficient, recyclable heterogeneous catalyst in acetonitrile under reflux conditions. The catalyst can be recovered from the subsequent reaction mixture and reused for at least five cycles without any appreciable loss in its efficiency. The core–shell structure and composition of the produced magnetic nanocatalyst were analyzed using FT-IR, XRD, VSM, SEM, EDX and TGA techniques.A simply, highly versatile and efficient synthesis of 5-phenyl-spiro diindeno pyridineindenoquinoxaline]-diones is achieved through five component one pot reaction of ninhydrin, 1,2-diaminobenzene, 1,3-indandione and anilines. |
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