Copper(I)‐catalyzed Cyclization Reactions of Ethyl ( E )‐α‐Ethynyl‐β‐Aryl‐α,β‐Unsaturated Esters with N ‐Sulfonyl Azides: Synthesis of 1‐Aminonaphthalene, 3‐Aminobenzofuran, and 3‐Aminothiobenzofuran Derivatives