Efficient Access to Extended Yagupolskii–Umemoto‐Type Reagents: Triflic Acid Catalyzed Intramolecular Cyclization of <i>ortho</i>‐Ethynylaryltrifluoromethylsulfanes

Abstract

Chef im Ring: Die S-(Trifluormethyl)benzo[b]thiophenium-Salze 1, Analoga für Yagupolskii-Umemoto-Reagentien, wurden durch eine neuartige Trifluormethansulfonsäure-katalysierte intramolekulare Cyclisierung aus ortho-Ethinylaryltrifluormethylsulfanen 2 synthetisiert. 1 j erwies sich als besonders nützlich in der elektrophilen Trifluormethylierung von β-Ketoestern und Dicyanalkylidenen. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.