Synthesis of spiro[indoline-3,4'-pyrano[2,3-c]pyrazole] and spiro[indoline-3,4'-pyrano[2,3-c]chromene] derivatives using silica-bonded ionic liquids as a recyclable catalyst in aqueous medium

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-l-phenyl-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. Silica-bonded ionic liquids is employed as a recyclable catalyst for the synthesis of spiro[indoline-3,4'-pyrano[2,3-c]pyrazoles] and spiro[indoline-3,4'-pyrano[2,3-c]chromene via one-pot condensation reaction of isatin, activated methylene reagents, and 3-methyl-l-phenyl-5-pyrazolone or 4-hydroxy coumarin respectively in refluxing aqueous medium in good to high yields. [GRAPHICS] .