Cycloadditions of 2-nitro 1,3-dienes to enamines. Asymmetric induction and synthesis of unsaturated nitroketones and diels-alder adducts via [4+2] heterocyloadditions.
作者:Rafael Chinchilla、Jan-E. Bäckvall
DOI:10.1016/s0040-4039(00)61168-1
日期:1992.9
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。