Reaction of the lithio-derivative of methoxyallene with hydrazones. Part 2: Formation of 3-pyrrolines and azetidines; synthetic and mechanistic aspects
作者:Valérie Breuil-Desvergnes、Jacques Goré
DOI:10.1016/s0040-4020(01)00031-x
日期:2001.3
3-pyrrolines when the time and temperature of the reaction are increased, but the rate of this transformation depends on the substituents of the terminal nitrogen. A reaction mechanism is proposed which involves intermolecular or intramolecular electron transfers from the lithium amide leading to hydrazinyl radicals. The relative stabilities of these intermediates may then explain the role of the substituents
当在THF中运行时,α-硫代甲氧基烯丙基与芳族的反应生成3-吡咯啉。对于SAMP-hydr,该反应在几乎完全立体分化的情况下发生。与其他(二甲基,哌啶基,吗啉基)一起,3-吡咯啉带有氮杂环丁烷。但是,后一种化合物的形成是可逆的,因为当反应时间和温度增加时它们会转变成3-吡咯啉,但是这种转变的速率取决于末端氮的取代基。提出了一种反应机理,该反应机理涉及从酰胺锂进行分子间或分子内电子转移,从而导致肼基自由基。外-挖激进的过程。