Iridium(III)-Catalyzed Intermolecular Allylic C–H Amidation of Internal Alkenes with Sulfonamides
作者:Pinki Sihag、Masilamani Jeganmohan
DOI:10.1021/acs.joc.9b02047
日期:2019.10.18
aryl-alkyl alkenes, the amidation selectively takes place at the alkyl-substituted allylic carbon. Meanwhile, the better selectivity was also observed in the unsymmetrical aryl-aryl alkenes having an electron-withdrawing substituent at one of the aryl groups. A possible reaction mechanism involving a π-allyl iridium intermediate was proposed and supported by the deuterium labeling studies. The deuterium labeling
证明了具有取代基的内酰胺与取代的磺酰胺的Ir(III)催化的直接烯丙基CH酰胺化反应,而没有取代基。本方案以高度原子经济和分步经济的方式提供了取代的烯丙基胺。该反应与对称和不对称内部烯烃以及取代的磺酰胺相容。有趣的是,在芳基-烷基烯烃的反应中,酰胺化选择性地发生在烷基取代的烯丙基碳上。同时,在其中一个芳基上具有吸电子取代基的不对称芳基-芳基烯烃中也观察到更好的选择性。提出了一种可能的涉及π-烯丙基铱中间体的反应机理,并得到了氘标记研究的支持。