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Michael Reaction of 1,3-Dicarbonyls with Enones Catalyzed by a Hydroxyapatite-Bound La Complex.

✍ Scribed by Kohsuke Mori; Michitaka Oshiba; Takayoshi Hara; Tomoo Mizugaki; Kohki Ebitani; Kiyotomi Kaneda

Publisher: John Wiley and Sons
Year: 2005
Weight: 29 KB
Volume: 36
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.200540042

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## Abstract Using the __C__~2~‐symmetric bis‐oxazoline copper(II) catalyst **6f** as a chiral Lewis acid, α′‐phosphoric enones **2** undergo 1,3‐dipolar cycloaddition with nitrones **3** to provide isoxazolidines **4** with very high enantioselectivity and __endo/exo__ selectivity.