Azodicarboxamides vs. Azodicarboxylates in Reactions against Thioisomünchnones: 1,3-Dipolar Cycloaddition or Nucleophilic Addition?
作者:Bárbara Sánchez、Ignacio López、Mark E. Light、Guadalupe Silvero、José Luis Bravo
DOI:10.1002/ejoc.200901349
日期:2010.3
as 1,3-dipoles. The reactions yield thioureido compounds. Their formation could be explained, on the basis of experimental results and preliminary theoretical calculations, by a nucleophilic addition followed by rearrangement; however, a formal 1,3-dipolar cycloaddition and subsequent fragmentation and rearrangement of the transient cycloadducts could not be ruled out. Reactions are carried out in refluxing
本通讯介绍了关于使用偶氮二甲酰胺对抗中离子杂环作为 1,3-偶极的第一项研究。该反应产生硫脲基化合物。根据实验结果和初步理论计算,它们的形成可以通过亲核加成和重排来解释。然而,不能排除正式的 1,3-偶极环加成以及随后的瞬时环加合物的碎裂和重排。反应在回流的甲苯中进行,并在 90-240 分钟内完成。产品的结构解析基于单晶 X 射线分析,以及其他光谱数据和 2D-NMR 相关性