Palladium(II)‐Catalyzed Aminotrifluoromethoxylation of Alkenes: Mechanistic Insight into the Effect of
<i>N</i>
‐Protecting Groups
作者:Chaohuang Chen、Chuanqi Hou、Pinhong Chen、Guosheng Liu
DOI:10.1002/cjoc.201900516
日期:2020.4
An efficient palladium‐catalyzed regioselective 5‐exo aminotrifluoromethoxylation of alkenes has been established herein, which provides a practical route towards the synthesis of OCF3‐containing pyrrolidines. tert‐Butyloxycarbonyl (Boc) as an amino protecting group plays a significant role in both the chemo‐ and regioselectivities. In addition, preliminary mechanistic studies reveal that the amino
本文已经建立了一种有效的钯催化烯烃的区域选择性5-外氨基三氟甲氧基化反应,为合成含OCF 3的吡咯烷提供了一条可行的途径。叔丁氧羰基(Boc)作为氨基保护基团在化学和区域选择性中都起着重要作用。此外,初步的机理研究表明,底物的氨基保护基团和钯催化剂的抗衡阴离子在反应效率中起着关键作用,大概是由于烷基-Pd(II)中间体的异构化。此外,还可以通过引入空间庞大的吡啶基-恶唑啉配体来实现不对称的5-exo氨基三氟甲氧基化反应。