Highly Efficient Copper-Catalyzed <i>N</i>-Arylation of Nitrogen-Containing Heterocycles with Aryl and Heteroaryl Halides
作者:Liangbo Zhu、Liang Cheng、Yuxi Zhang、Rugang Xie、Jingsong You
DOI:10.1021/jo062059f
日期:2007.4.1
have been readily synthesized in a straightforward fashion from least expensive starting materials in short steps in high yields. Relatively mild and highly efficient CuI-catalyzed N-arylation procedures for imidazoles with aryl and heteroaryl bromides or chlorides have been developed in the presence of 4a and Cs2CO3. It is important to note that the protocol could tolerate functional groups such as
新的(S)-吡咯烷基基甲基咪唑配体(4a - c)已经很容易地以最直接的方式由最便宜的原料在短时间内以高收率合成。在4a和Cs 2 CO 3存在下,已开发出相对温和且高效的CuI催化的咪唑与芳基和杂芳基溴化物或氯化物的N芳基化方法。重要的是要注意,该方案可以耐受芳基卤化物上的官能团,例如酯,腈,硝基,酮,游离羟基和游离伯胺。该方案也可适用于其他富含π电子的氮杂环(吡咯,吡唑,吲哚,苯并咪唑和三唑),可提供高至极好收率的N-芳基唑。