Treatment of various dienimides in the presence of a Lewis acid and (trimethylsiloxy)furan leads to the corresponding aniline furan‐2(5H)‐ones. The same treatment with furan yields a triaryl product and, surprisingly, a byproduct with a pentacyclo[5.4.0.0.0.0]undecane main core. The formation of this birdcage system containing nine stereogenic centres was produced with complete diastereoselectivity.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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Giroux et al. (2009) studied this question.
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