Synthesis of novel electron-deficient chromone-fused dienes via phosphine catalyzed [4+2] annulation |
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| Authors: | Herbert Waldmann Hanna Bruss Heiko Dückert Kamal Kumar |
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| Institution: | a Max Planck Institut für molekulare Physiologie, Otto-Hahn Strasse 11, 44227-Dortmund, Germany
b Universität Dortmund, Fachbereich Chemie, 44221-Dortmund, Germany |
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| Abstract: | α-Chromonyl ketoesters undergo phosphine catalyzed 4+2]-annulation reactions with acetylene carboxylates to yield tricyclic benzopyrones in good yields. Under mild acidic conditions, the tricyclic benzopyrones rearrange to provide highly substituted and electron-poor chromone-fused dienes in good yields. |
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| Keywords: | Benzopyrones Lewis base catalysis Rearrangements Dienes |
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