作者:Alexander Stadler、Klaus Zangger、Ferdinand Belaj、Gert Kollenz
DOI:10.1016/s0040-4020(01)00625-1
日期:2001.7
Neat carbomethoxypivaloylketene, the first fairly persistent α-oxoketene stabilized both electronically as well as sterically, is generated by flash vacuum pyrolysis of the corresponding furan-2,3-dione. It adds primary amines to afford pivaloyl-malonic acid amides and undergoes hetero-Diels–Alder reactions to furnish usual and unusual [4+2] adducts. Some stereo- and regiochemical features are verified
通过快速真空热解相应的呋喃-2,3-二酮,可以生成纯净的碳甲氧基新戊基烯酮,这是一种在电子和空间上均稳定的相当持久的α-氧杂环丁烯。它添加伯胺以提供新戊酰-丙二酸酰胺,并进行杂Diels-Alder反应,以提供通常和不寻常的[4 + 2]加合物。借助2D NMR实验和X射线结构分析,验证了某些立体和区域化学特征。