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This protocol provides a fast and straightforward approach to synthesize unusual tricyclic oxindoles in an efficient and atom\u2010economic manner. Mechanistically, the present cycloaddition may proceed through a cascade sequence involving double Michael addition, double cyclization, double [1,5]\u2010hydrogen shift, and group migration. The introduction of a special alkyl group to the allenoate is believed to play a key role in the cascade reaction. This method also features a broad substrate scope, which is particularly useful for the delivery of a large number of compounds.<\/jats:p>","DOI":"10.1002\/chem.201402576","type":"journal-article","created":{"date-parts":[[2014,4,2]],"date-time":"2014-04-02T12:03:37Z","timestamp":1396440217000},"page":"5905-5909","source":"Crossref","is-referenced-by-count":49,"title":["Isocyanide\u2010Based Multicomponent Reactions: Concise Synthesis of Spirocyclic Oxindoles with Molecular Complexity by Using a [1,5]\u2010Hydrogen Shift as the Key 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