Intramolecular Iron-Mediated Diene/Olefin Cyclocoupling:  Formation of Carbon Spirocycles

A short and convenient diastereoselective synthesis of all-carbon spirocylic molecules was developed. A straightforward protocol that involves rearrangement of the diene−Fe(CO)₃ complex followed by cyclization delivers the desired product. The reaction substrates were easily prepared by reaction of an appropriate nucleophile and a cyclohexadienyl-Fe(CO)₃ cation.