Chalcogen-Bonding Catalysis with Telluronium Cations
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Weiss, Robin
[1
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Aubert, Emmanuel
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Pale, Patrick
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Mamane, Victor
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Univ Strasbourg, LASYROC, UMR 7177, 1 Rue Blaise Pascal, F-67000 Strasbourg, FranceUniv Strasbourg, LASYROC, UMR 7177, 1 Rue Blaise Pascal, F-67000 Strasbourg, France
Mamane, Victor
[1
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机构:
[1] Univ Strasbourg, LASYROC, UMR 7177, 1 Rue Blaise Pascal, F-67000 Strasbourg, France
[2] Univ Lorraine, CRM2, BP 70239,Blvd Aiguillettes, F-54506 Vandoeuvre Les Nancy, France
Chalcogen bonding results from non-covalent interactions occurring between electrodeficient chalcogen atoms and Lewis bases. Among the chalcogens, tellurium is the strongest Lewis acid, but Te-based compounds are scarcely used as organocatalysts. For the first time, telluronium cations demonstrated impressive catalytic properties at low loadings in three benchmark reactions: the Friedel-Crafts bromination of anisole, the bromolactonization of omega-unsaturated carboxylic acids and the aza-Diels-Alder between Danishefsky's diene and imines. The ability of telluronium cations to interact with a Lewis base through chalcogen bonding was demonstrated on the basis of multi-nuclear (O-17, P-31, and Te-125) NMR analysis and DFT calculations.