Metal-Free [2 + 1 + 2]-Cycloaddition of Tosylhydrazones with Hexahydro-1,3,5-triazines To Form Imidazolidines
作者:Pei Liu、Guangyang Xu、Jiangtao Sun
DOI:10.1021/acs.orglett.7b00600
日期:2017.4.7
using tosylhydrazones and hexahydro-1,3,5-triazines as the substrates under metal-free reaction conditions. Importantly, the role of LiOtBu has been confirmed not only to release the diazo but also to promote the cycloaddition. Further mechanistic investigations reveal that the reaction proceeds through a stepwise [2 + 1 + 2] process.
在没有金属的反应条件下,使用甲苯磺酰hydr和六氢-1,3,5-三嗪作为底物已经完成了对咪唑烷的新方案。重要的是,已经证实了LiO t Bu的作用不仅可以释放重氮,还可以促进环加成。进一步的机理研究表明,反应通过逐步的[2 +1 + 2]过程进行。