Synthesis of Naphthalenes via Platinum-Catalyzed Hydroarylation of Aryl Enynes

An efficient synthetic method of functionalized naphthalenes having hydrogen, alkyl, alkenyl, aryl, or heteroaryl groups on the 4-position and ethoxycarbonyl group on the 2-position was developed through selective Pt-catalyzed 6-endo intramolecular hydroarylation of ethyl (E)-2-ethynyl/alkynyl cinnamates.