A Highly Efficient and Selective Route to Isomeric Cyclic Diazadienes
摘要:
A highly selective Lewis acid-catalyzed ring expansion of methylenecyclopropyl hydrazones to isomeric cyclic diazadienes is reported. In general, good to excellent yields and selectivities were obtained for a broad range of hydrazone derivatives.
开发了一种通过MAD / n - Bu 4 NI介导的单活化MCP扩环制备官能化亚烷基吡咯烷的新颖合成途径。发现该反应的底物范围对于多种醛亚胺而言是宽泛的,并且对称地以及非对称地单活化的MCP以良好的产率(高达92%)产生相应的五元杂环化合物。该方法是对以前有关MCP环扩环的报告的补充,该报告显示,只需改变催化剂体系,就可以从同一MCP中实现不同杂环骨架的选择性合成。