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Lewis Base Catalyzed [4+2] Annulation of Electron-Deficient Chromone-Derived Heterodienes and Acetylenes

✍ Scribed by Dipl.-Chem. Heiko Dückert; Dr. Vivek Khedkar; Prof. Dr. Herbert Waldmann; Dr. Kamal Kumar

Publisher: John Wiley and Sons
Year: 2011
Tongue: English
Weight: 300 KB
Volume: 17
Category: Article
ISSN: 0947-6539
DOI: 10.1002/chem.201003572

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✦ Synopsis

Abstract

Lewis base catalyzed [4+2] annulation reactions between electron‐deficient chromone oxa‐ and azadienes and acetylene carboxylates provide tricyclic benzopyrones inspired by natural products. An asymmetric synthesis of the tricyclic benzopyrones was developed by using modified cinchona alkaloids as enantiodifferentiating Lewis base catalysts.

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