ChemInform Abstract: Regioselective Friedel—Crafts Reaction of Electron‐Rich Benzenoid Arenes and Spiroepoxyoxindole at the Spiro‐Center: Efficient Synthesis of Benzofuroindolines and 2H‐Spiro[benzofuran]‐3, 3′‐oxindoles. Issue 49 (17th November 2016)