Synthesis of <i>N</i>
-alkyl-<i>N</i>
′-aryl or Alkenylpiperazines: A Copper-Catalyzed C-N Cross-Coupling in the Presence of Aryl and Alkenyl Triflates and DABCO
作者:Majid Ghazanfarpour-Darjani、Forugh Barat-Seftejani、Mehdi Khalaj、Seyed Mahmoud Mousavi-Safavi
DOI:10.1002/hlca.201700082
日期:2017.8
introduction of an aryl and alkyl motif onto the piperazine is not always straightforward, direct arylation and alkenylation of 1,4‐diaza‐bicyclo[2.2.2]octane would obviate the inefficiencies associated with the preparation of these target molecules. We have utilized alkyl halides, aryl or alkenyl triflates, and 1,4‐diaza‐bicyclo[2.2.2]octane for the synthesis of N‐alkyl‐N′‐aryl or alkenylpiperazines
不对称哌嗪是许多药物的关键成分。鉴于将芳基和烷基基序选择性引入哌嗪并不总是那么简单,因此1,4-二氮杂双环[2.2.2]辛烷的直接芳基化和烯基化将消除与这些目标分子制备相关的低效率。我们利用卤代烷,芳基或烯基三氟甲磺酸酯和1,4-二氮杂双环[2.2.2]辛烷来合成N-烷基-N'-芳基或烯基哌嗪。在NMP中使用CuCl,t- BuOLi来确定最佳条件。烯基三氟甲磺酸盐需要N,N'-二甲基乙二胺和更高的温度提供所需的交叉偶联产物。在最佳反应条件下,成功地偶联了具有缺电子和富电子基团的底物。