Stereoselective syntheses of functionalized spirocyclopenteneoxindoles via triphenylphosphine-catalyzed [3+2] cycloaddition reactions

Spirocyclopenteneoxindole derivatives were obtained by stereoselective triphenylphosphine-catalyzed [3+2] cycloadditions of ynones and alkylidene oxindole derivatives. This approach is based on the Michael addition of ynones to alkylidene oxindole derivatives, followed by intermolecular α -addition...

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