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Palladium‐Catalyzed Zinc‐Amide‐Mediated CH Arylation of Fluoroarenes and Heteroarenes with Aryl Sulfides
Authors:Shinya Otsuka  Prof?Dr Hideki Yorimitsu  Prof?Dr Atsuhiro Osuka
Institution:1. Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo‐ku, Kyoto 606‐8502 (Japan);2. ACT‐C, JST, Sakyo‐ku, Kyoto 606‐8502 (Japan)
Abstract:C?H arylation of polyfluoroarenes and heteroarenes with aryl sulfides proceeds smoothly with the aid of a palladium–N‐heterocyclic carbene catalyst. A bulky zinc amide, TMPZnCl ? LiCl, plays a key role as an effective base to generate the corresponding arylzinc species in situ. This arylation protocol is practically much easier to perform than our previous method, which necessitates preparation of the arylzinc reagents in advance from the corresponding aryl halides. Aryl sulfides that are prepared through sulfur‐specific reactions, such as SNAr sulfanylation and extended Pummerer reactions, undergo this direct arylation, offering interesting transformations that are otherwise difficult to achieve with conventional halogen‐based organic synthesis.
Keywords:C  H arylation  C  S bond activation  organosulfur compounds  organozinc compounds  palladium
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