Reactive, selective, and tough, the chiral Lewis acid generated from 1 and SnCl4 catalyzes the enantioselective Diels–Alder reactions of various classes of substrates (see scheme). The reactive species preserves its asymmetric induction ability even in the presence of a large excess of SnCl4. Importantly, this catalyst system is tolerant to a small amount of moisture, oxygen, and Lewis bases. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2005/z461319_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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Futatsugi et al. (2005) studied this question.
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