Asymmetric Vinylogous Diels–Alder Reactions Catalyzed by a Chiral Phosphoric Acid |
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Authors: | Xu Tian Dr. Nora Hofmann Prof. Dr. Paolo Melchiorre |
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Affiliation: | 1. ICIQ—Institute of Chemical Research of Catalonia, Avenida Pa?sos Catalans 16, 43007 Tarragona (Spain) http://www.iciq.es/portal/862/default.aspx;2. ICREA—Institució Catalana de Recerca i Estudis Avan?ats, Passeig Lluís Companys 23, 08010 Barcelona (Spain) |
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Abstract: | An unprecedented way to extend the synthetic utility of the Diels–Alder reaction to include a vinylogous reactivity space is described. A commercially available chiral phosphoric acid catalyst effectively activates cyclic 2,4‐dienones towards a vinylogous [4+2] cycloaddition with 2‐vinylindoles, which leads to stereochemically dense tetrahydrocarbazoles. The reaction proceeds with a high level of remote stereocontrol and exclusive chemoselectivity for the more distant double bond of the dienone. |
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Keywords: | asymmetric catalysis Brø nsted acids Diels– Alder reactions organocatalysis synthetic methods |
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