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. 2013 Aug;17(3):563-71.
doi: 10.1007/s11030-013-9456-8. Epub 2013 Jun 19.

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

Qing-Fa Zhou  1 , Xue-Ping Chu, Fei-Fei Ge, Cheng Li, Tao Lu
Affiliations

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

Qing-Fa Zhou et al. Mol Divers. 2013 Aug.

Abstract

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 [Formula: see text]-addition using 50 mol% triphenylphosphine as catalyst.

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