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Synthesis of novel electron-deficient chromone-fused dienes via phosphine catalyzed [4+2] annulation

✍ Scribed by Herbert Waldmann; Hanna Bruss; Heiko Dückert; Kamal Kumar


Book ID
104098920
Publisher
Elsevier Science
Year
2011
Tongue
French
Weight
449 KB
Volume
52
Category
Article
ISSN
0040-4039

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## 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 a