Highly substituted pyrrolidines 4 are formed in a highly diastereo- and enantioselective 1,3-dipolar cycloaddition reaction of azomethine ylides with electron-deficient alkenes 2. The azomethine ylides are generated from glycinates 1 catalyzed by a chiral zinc(II) bisoxazoline catalyst 3. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2002/z19669_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
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Gothelf et al. (2002) studied this question.