Synthesis of 2-nitro 1,3-dienes. Useful intermediates in the preparation of unsaturated 1,4-dicarbonyl compounds
作者:Jan-E. Bäckvall、Ulrika Karlsson、Rafael Chinchilla
DOI:10.1016/0040-4039(91)80097-p
日期:1991.9
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.
通过亚硝化消除序列从共轭二烯获得2-硝基1,3-二烯。硒部分的消除是由碱催化的。分离了2-硝基1,3-二烯中的几种,而其他则原位产生并用于进一步反应。发现它们易于与烯醇醚反应得到硝酸酯,随后将其转化为不饱和的1,4-二羰基化合物。