Silver-Catalyzed [2+1] Cyclopropenation of Alkynes with Unstable Diazoalkanes:<i>N</i>-Nosylhydrazones as Room-Temperature Decomposable Diazo Surrogates
作者:Zhaohong Liu、Qiangqiang Li、Peiqiu Liao、Xihe Bi
DOI:10.1002/chem.201605335
日期:2017.4.6
The [2+1] cycloaddition of alkynes with diazo compounds represents one of the most powerful and reliable methods for the construction of cyclopropenes. However, it remains a formidable challenge to accomplish the cyclopropenation of alkynes with non‐stabilized diazoalkanes, owing to the fact that such compounds are unstable and prone to detonation. Herein, we report a general silver‐catalyzed cyclopropenation
炔与重氮化合物的[2 + 1]环加成反应是构建环丙烯的最有效和最可靠的方法之一。然而,由于这类化合物不稳定且易于爆炸,因此用非稳定的重氮烷烃完成炔烃的环丙烷化仍是一项艰巨的挑战。在此,我们首次报道了炔烃与不稳定的重氮烷的银催化的环丙烷化反应,这是首次发现和应用了N-壬基hydr唑作为室温可分解的重氮替代物。该方法允许有效地组装各种环丙烯衍生物,否则这些环丙烯衍生物难以通过常规方法来获得。