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Unactivated yne-en-ynes reacted with a range of substituted aryl halides in the presence of Pd(OAc)2–PPh3 to afford diazaspiro[4.5]decane with exocyclic double bonds. Three carbon–carbon bonds are formed in this domino reaction, which involves highly regioselective C–C coupling and spiro scaffold steps.

Graphical abstract: One-step synthesis of diazaspiro[4.5]decane scaffolds with exocyclic double bonds

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