One-step synthesis of diazaspiro[4.5]decane scaffolds with exocyclic double bonds†
Abstract
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.