situ from the corresponding nitroseleno compounds, react with enamines affording [4+2] heterocycloadducts of different stability. With chiral enamines a high asymmetric induction was observed in some cases. Some of the adducts were readily hydrolyzed to unsaturated γ-nitroketones whereas others spontaneously rearranged to Diels-Alder-type carbocycloadducts.
由相应的硝基
硒代化合物就地生成的2-硝基1,3-二烯与烯胺反应,提供不同稳定性的[4 + 2]杂环加合物。在某些情况下,使用手性烯胺有很高的不对称诱导性。一些加合物很容易
水解为不饱和的γ-硝基酮,而另一些自发地重排为Diels-Alder型碳环加合物。