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ChemInform Abstract: Bifunctional Amino Squaramide Catalyzed Asymmetric Spiroannulation Cascades with Aliphatic β,γ-Unsaturated α-Keto Esters: Controlling an Aldehyde Enolate.

✍ Scribed by Xiaoqin Wang; Weijun Yao; Zhihui Yao; Cheng Ma

Book ID: 112046551
Publisher: John Wiley and Sons
Year: 2012
Weight: 48 KB
Volume: 43
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.201228154

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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).