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Title
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Synthesis of spiro[indoline3,4pyrano[2,3c]pyrazole] and spiro[indoline3,4pyrano[2,3c]chromene] derivatives using silicabonded ionic liquids as a recyclable catalyst in aqueous medium
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Abstract
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Silica-bonded ionic liquids is employed as a
recyclable catalyst for the synthesis of spiro[indoline-3,4?-
pyrano[2,3-c]pyrazoles] via one-pot condensation reaction
of isatin, activated methylene reagents, and 3-methyl-lphenyl-
5-pyrazolone in refluxing aqueous medium in good
to high yields. Also, these silica-bonded ionic liquids were
used as catalysts for the synthesis of spiro[indoline-3,4?-
pyrano[2,3-c]chromene derivatives in refluxing aqueous
medium in high yields. Catalyst could be recycled for several
times without any additional treatment.
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