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ChemInform Abstract: Synthesis of Optically Active Dihydropyrans from Asymmetric [4 + 2] Cycloaddition of β,γ-Unsaturated α-Ketoesters with Allenic Esters.

✍ Scribed by Cheng-Kui Pei; Yu Jiang; Min Shi

Book ID: 115553887
Publisher: John Wiley and Sons
Year: 2012
Weight: 51 KB
Volume: 43
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.201243134

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## Abstract Asymmetric [4 + 2] cycloaddition of β,γ‐unsaturated α‐keto esters (I) and (IV) with oxazolones (II) proceeds with excellent diastereoselectivity and high enantioselectivity (up to 97% e.e.) in the presence of a quinidine‐derived bifunctional organocatalyst (NQD).