Copper-Catalyzed Direct Ortho-Alkylation of <i>N</i>-Iminopyridinium Ylides with <i>N</i>-Tosylhydrazones
作者:Qing Xiao、Lin Ling、Fei Ye、Renchang Tan、Leiming Tian、Yan Zhang、Yuxue Li、Jianbo Wang
DOI:10.1021/jo4002883
日期:2013.4.19
Copper-catalyzed cross-coupling of N-tosylhydrazones with N-iminopyridinium ylides leads to the direct C–H alkylation. This direct C–H bond alkylation transformation uses inexpensive CuI as the catalyst without any ligand. The reaction is operationally simple and conducted under mild conditions, giving the corresponding alkylated pyridines in moderate to good yields. DFT calculation provides insights
铜催化的N-甲苯磺酰hydr与N-亚氨基吡啶鎓的烷基化物的交叉偶联导致直接的CH烷基化。这种直接的C–H键烷基化转化反应使用廉价的CuI作为催化剂,没有任何配体。该反应操作简单并且在温和的条件下进行,以中等至良好的产率得到相应的烷基化吡啶。DFT计算提供了对反应机理的见解,表明反应是通过Cu卡宾迁移插入过程进行的。