Styrene as 4π-Component in Zn(II)-Catalyzed Intermolecular Diels–Alder/Ene Tandem Reaction

A mild Zn-catalyzed intermolecular Diels–Alder/ene tandem reaction with styrene as a 4π-component is reported. A variety of dihydro­naphthalene products could be prepared in moderate to good yields. Moreover, a combination of DFT calculations and experiments was performed to further understand the mechanism of this unique tandem reaction.