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
在
路易斯酸和(三甲基甲
硅烷氧基)
呋喃的存在下处理各种二烯
酰亚胺产生相应的
苯胺呋喃-2(5H)-酮。用
呋喃进行相同处理产生三芳基产物,并且令人惊讶地产生具有五环[5.4.0.0.0.0]
十一烷主核的副产物。这种包含九个立体中心的鸟笼系统的形成是完全非对映选择性的。 (© Wiley-
VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)