whereas others were generated in situ and used for further reaction. They were found to react readily with enol ethers to give nitronic ester, which subsequently were transformed to unsaturated 1,4-dicarbonyl compounds.
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 asymmetricinduction 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.