Synthesis and chemical reactivity of methoxycarbonyl-1,3-dioxinyl(pivaloyl)ketene—a persistent α-oxoketene
作者:Bianca C. Wallfisch、Ferdinand Belaj、Curt Wentrup、C. Oliver Kappe、Gert Kollenz
DOI:10.1039/b111143d
日期:2002.2.22
Flash vacuum pyrolysis of an equimolar mixture of 4-pivaloyl- and 4-methoxycarbonyl-5-tert-butylfuran-2,3-dione affords the new and remarkably stable α-oxoketene 6 as the result of an unusual dimerization of the primarily formed monomeric α-oxoketenes 1 and 3, respectively. [2 + 2] Cycloaddition reactions of 6 and dialkylcarbodiimides furnish functionalized imino-β-lactams 7, while reaction with nucleophiles
闪蒸真空热解 4-新戊酰和 4-甲氧羰基-5-叔丁基呋喃-2,3-二酮由于首先形成的单体α-氧杂环丁烯1和3的异常二聚作用,得到了新的且非常稳定的α-氧杂环丁烯6。[2 + 2] 6和二烷基碳二亚胺的环加成反应可提供功能化的亚氨基β-内酰胺7,而与亲核试剂的反应可将6完全降解成较小的片段。6和7的结构确认主要基于单晶X射线分析。