Abstract
AbstractA new class of bridged alkyl ionic liquids has been successfully developed and they are shown to be efficient catalysts for the synthesis of a wide range of densely functionalized spiro[4H‐pyran‐3,3′‐oxindole] derivatives. With only 1 mol% catalyst, all the reactions underwent smoothly in aqueous ethanol solution at ambient temperature and afforded the corresponding products in good to excellent yields within a short reaction time. This is a simple and green protocol with significant advantages such as the use of environmentally friendly solvent, mild conditions, easy work up, no chromatographic separation, and applicability for large‐scale synthesis. The catalyst could be reused eight times at least.
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