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Synfacts 2008(10): 1063-1063  
DOI: 10.1055/s-2008-1078144
Metal-Catalyzed Asymmetric Synthesis and Stereoselective Reactions
© Georg Thieme Verlag Stuttgart ˙ New York

Rhodium-Catalyzed Intermolecular [4+2] Annulation of Acyl Phosphonates

Contributor(s): Hisashi Yamamoto, Pingfan Li
K. Tanaka*, R. Tanaka, G. Nishida, K. Noguchi, M. Hirano
Tokyo University of Agriculture and Technology, Japan
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Publikationsdatum:
22. September 2008 (online)

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Significance

In connection with their recent report on using dicarbonyl compounds in cross-[4+2] annulation with 2-alkynylbenzaldehyde (Angew. Chem. Int. Ed. 2008, 47, 5820, Synfacts 2008, 1062), the Tanaka group also succeeded in using acyl phosphonates as substrates. Nearly enantiopure benzopyranones with the phosphonate-substituted quaternary carbon center are obtained in good to moderate yields.