Abstract
β-Cyclodextrin-epichlorohydrin nanosponge polymer, β-CD/EP, was prepared from the stepwise polymerization of β-cyclodextrin with epichlorohydrin under basic conditions and characterized by FT-IR spectroscopy, thermogravimetric analysis, scanning electron microscopy and Brunauer–Emmett–Teller. An efficient synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazole] and pyranopyrazole derivatives is described using β-CD/EP as a stationary micro-vessel and basic heterogeneous catalyst via a four component reaction under solvent-free conditions.
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