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Abstract
A three-component reaction of isatin, 3-methyl-1-phenyl-1H-pyrazol-5-amine, and piperidine-2,4-dione was treated in ionic liquids catalyzed by TsOH and provided an efficient and green method for the synthesis of spiro[indoline-3,4′-pyrazolo[3, 4-b][1,6]naphthyridine]-2,5′(1′H)-dione derivatives in high yields.
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