Efficient Synthesis of <i>N</i>-Aryl-Aza-Crown Ethers via Palladium-Catalyzed Amination
作者:Xiao-Xiang Zhang、Stephen L. Buchwald
DOI:10.1021/jo005577d
日期:2000.11.1
N-Aryl-aza-crown ethers were efficiently prepared by reaction of an aza-crown ether with an aryl bromide via a palladium-catalyzed amination. The combination of Pd(2)(dba)(3) and a biphenyl-based electron-rich bulky monophosphine is effective for catalyzing the coupling of 1-aza-15-crown-5 with both electron-deficient and electron-rich aryl bromides under mild conditions. N-Aryl-aza-crown ethers were
通过使氮杂-冠状醚与芳基溴化物通过钯催化的胺化反应,可以有效地制备N-芳基-氮杂-冠状醚。Pd(2)(dba)(3)与基于联苯的富电子大体积单膦的组合可有效催化1-aza-15-crown-5与缺电子和富电子芳基溴化物的偶联在温和的条件下。N-芳基-氮杂-冠醚的产率为75-91%。具有邻芳基取代基的N-芳基-氮杂-冠醚也可以使用该催化剂体系合成,尽管收率较低(约40%)。