A new route to several medium ring heterocycle and carbocycle fused naphthalene derivatives of potential medicinal importance has been developed involving tandem applications of Claisen rearrangement and ring??closing diene metathesis as key steps. ... A new route to several medium ring heterocycle and carbocycle fused naphthalene derivatives of potential medicinal importance has been developed involving tandem applications of Claisen rearrangement and ring?? ...