1,3-dipolar cycloadditions of 2-Ethoxy- and 2-(ethylthio)-1-azetines with nitrile oxides, nitrile ylides and nitrilimines: An unexpected 1,2,4-triazole formation.
作者:Karl Hemming、Abdul-Bassett N. Luheshi、Alan D. Redhouse、Robert K. Smalley、J.Robin Thompson、Peter D. Kennewell、R. Westwood
DOI:10.1016/s0040-4020(01)85755-0
日期:1993.1
1,3-dipolar cycloadditions with nitrile oxides and nitrile ylides to give stable 4,5-bicyclic cycloadducts. With nitrilimines, however, the expected 1,3-dipolar cycloadducts and/or unexpected ring-opened products, namely 1,2,4-triazoles, are formed depending on the nature of the nitrilimine N-substituent. In contrast, the azetines fail to react with nitrile sulphides, azomethine ylides, nitrones, aryl
2-乙氧基和2-(乙硫基)-1-氮杂环丁烷容易与腈氧化物和腈发生1,3-偶极环加成反应,得到稳定的4,5-双环环加合物。然而,对于腈亚胺,取决于腈亚胺N-取代基的性质,形成了预期的1,3-偶极环加合物和/或未预期的开环产物,即1,2,4-三唑。相反,氮杂环丁烷不能与腈硫化物,甲亚胺基亚胺,硝酮,芳基叠氮化物和各种二烯反应。