Abstract
An efficient approach for the synthesis of pharmacologically important spiro[indoline‐3,4'‐pyrano[2,3‐c]pyrazole] derivatives from tandem, four component reaction of various hydrazines, isatins, β‐ketoesters, and malononitrile or methyl(ethyl)cyanoester in the presence of N,N,N',N'‐tetrabromobenzene‐1,3‐disulfonamide [TBBDA] and poly(N,N'‐dibromo‐N‐ethyl‐benzene‐1,3‐disulfonamide) [PBBS] as efficient organocatalysts was reported.
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