Journal
ORGANIC LETTERS
Volume 5, Issue 26, Pages 5043-5046Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol036076s
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[GRAPHICS] High diastereo- and enantioselectivities were obtained for the asymmetric 1,3-dipolar cycloaddition of azomethine ylides generated from N-alkylideneglycine esters with dipolarophiles using chiral phosphine-copper complexes as catalysts. Whereas the cycloaddition of azomethine ylides catalyzed by metal salts generally afforded endo-adducts as the predominant product, the present method is the first example of an exo-selective cycloaddition.
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