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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| http://dx.doi.org/10.1007/s11030-013-9456-8 | DOI Listing |
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