Metal-free electrochemical [3 + 2] heteroannulation of anilines with pyridines enabled by dual C–H radical aminations
作者:Mu-Jia Luo、Xuan-Hui Ouyang、Yan-Ping Zhu、Yang Li、Jin-Heng Li
DOI:10.1039/d1gc02922c
日期:——
electrochemical intermolecular [3 + 2] heteroannulation of anilines with electron-deficient pyridines enabled by dual C–H radicalaminations for producing functionally diverse benzo[4,5]imidazo[1,2-a]pyridines is described. The site-selectivity of aminations of aryl C(sp2)–H bonds relies on the electronic effect of two reaction partners: each contributed two reactive sites (a C(sp2)–H bond and a nitrogen
The selective synthesis of C-2/C-3 aminated five-membered heteroarenes incorporated various functionalities with aniline derivatives in a sustainable way remains an unmet challenge. This protocol presents a practical protocol for the C–H amination of heteroarenes via an electro-oxidative crosscoupling process. This electrosynthetic approach enables a facile access to a wide variety of synthetically
以可持续的方式选择性合成将各种功能与苯胺衍生物结合的 C-2/C-3 胺化五元杂芳烃仍然是一个未解决的挑战。该协议提出了一种通过电氧化交叉耦合过程对杂芳烃进行 C-H 胺化的实用协议。这种电合成方法可以轻松获得各种合成有用的杂芳烃衍生物,耐受范围广泛的官能团,并且适合克级合成。此外,初步的机理研究表明,该胺化反应可能涉及 N 中心自由基和吲哚自由基阳离子之间的自由基交叉偶联过程。
Highly chemo- and regioselective C–P cross-coupling reaction of quinone imine ketals with Ar<sub>2</sub>P(O)H to construct <i>ortho</i>-amino triarylphosphine derivatives
作者:Teng Liu、Yongqin Li、Feixiang Cheng、Xianfu Shen、Jianjun Liu、Jun Lin
DOI:10.1039/c9gc00989b
日期:——
A highly chemo- and regioselective approach for the construction of ortho-amino triarylphosphine oxides has been achieved through a C–P cross-coupling reaction involving quinoneimineketals (QIKs) with Ar2P(O)H and catalyzed via a Lewis base. This alternative protocol provided a wide substrate scope with excellent yields (82–95%), and a variety of ortho-amino triarylphosphines were obtained with high
Regioselective/electro-oxidative intermolecular [3 + 2] annulation for the preparation of indolines
作者:Qingqing Wang、Pan Wang、Xinlong Gao、Dan Wang、Shengchun Wang、Xingan Liang、Liwei Wang、Heng Zhang、Aiwen Lei
DOI:10.1039/c9sc05729c
日期:——
amines or vinyl anilines for the preparation of pyrrolidines or indolines, the intermolecular version is less studied. Herein, this electrochemical intermolecular oxidative annulation of anilines and alkenes for the preparation of indolines proceeded under external oxidant-free conditions. The most noteworthy achievement of our work is the facile generation of indolines with quaternary centers at the
intermolecular assembly of 2,2-disubstituted indolines has been developed. This protocol is based on a ligand and directing group free, iron-catalyzed radical [3 + 2] process, allowing efficient coupling of different N-sulfonylanilines with various α-substituted styrenes. Preliminary mechanistic studies elucidated the radical mechanism involving a reactive and versatile anilino radical and the importance