证明了钴(III)在N-亚硝基苯胺与炔烃的直接环化中独特的区域选择性和反应性,可方便地合成N-取代的吲哚。在钴(III)催化剂存在下,当使用不对称的间位取代的N-亚硝基苯胺时,观察到较高的区域选择性。此外,带有缺电子基团的内部炔烃在[Cp * Rh III ]催化的体系中几乎没有反应性,在这种转变中表现出良好的反应性。
report a condition-controlled divergent synthesis strategy of chalcones, quinolones and indoles, which was achieved via a C-Hactivation reaction of N-nitrosoanilines and cyclopropenones. Variations of Ag salts are observed to be crucial for divergently constructing the three distinct chemical scaffolds. A Rh(i)- and Rh(iii)-cocatalyzed decarbonylation/C-Hactivation/[3+2] annulation cascade reaction
Rhodium-Catalyzed Annulation of Tertiary Aniline <i>N</i>-Oxides to <i>N</i>-Alkylindoles: Regioselective C–H Activation, Oxygen-Atom Transfer, and <i>N</i>-Dealkylative Cyclization
作者:Bin Li、Hong Xu、Huanan Wang、Baiquan Wang
DOI:10.1021/acscatal.6b00311
日期:2016.6.3
[Cp*RhIII]-catalyzed annulation of tertiary aniline N-oxides with alkynes was reported to achieve the challenging ortho C–Hfunctionalization of tertiary anilines via N–O bond acting as a traceless directing group. More significantly, this system represents the first example which integrates C–H activation, oxygen-atom transfer, and N-dealkylative cyclization in one reaction. This unprecedented coupling
据报道,[Cp * Rh III ]催化炔烃与叔胺N-氧化物的环化反应是通过N-O键作为无痕导向基团实现的,具有挑战性的叔苯胺邻位C-H功能化。更重要的是,该系统代表了第一个示例,该示例在一个反应中集成了C–H活化,氧原子转移和N-脱烷基环化。这种空前的偶联反应使N-烷基吲哚衍生物的构建具有高效率,宽泛的底物范围和良好的官能团耐受性。
One-Pot Synthesis of Unsymmetrical 2,3-Diarylindoles by Site-Selective Suzuki-Miyaura Reactions of N-Methyl-2,3-dibromoindole
The Suzuki-Miyaura reaction of N-methyl-2,3-dibromoindole with two equivalents of boronic acids gave symmetrical 2,3-diarylindoles. The reaction with one equivalent of arylboronic acid resulted in site-selective formation of 2-aryl-3-bromoindoles. The one-pot reaction of 2,3-dibromoindole with two different arylboronic acids afforded unsymmetrical 2,3-diarylindoles containing two different aryl groups.
Rh(<scp>iii</scp>)-catalyzed chemoselective C–H functionalizations of tertiary aniline N-oxides with alkynes
作者:Xiaolei Huang、Wenbo Liang、Yang Shi、Jingsong You
DOI:10.1039/c6cc02217k
日期:——
Two novel Rh(iii)-catalyzed chemoselective functionalizations of tertiary aniline N-oxides with alkynes, including annulation via the sequential C(sp2)–H and C(sp3)–N activation and an O-atom transfer (OAT) process, have been described.
Rhodium(III)-catalyzed synthesis of indoles from 1-alkylidene-2-arylhydrazines and alkynes via C–H and N–N bond cleavages
作者:Takanori Matsuda、Yuki Tomaru
DOI:10.1016/j.tetlet.2014.04.016
日期:2014.5
1-Alkylidene-2-arylhydrazines undergo annulative coupling with internal alkynes in the presence of a rhodium(III) catalyst and a copper(II) salt. The reaction proceeds through cleavage of the C–H and N–N bonds of hydrazines to afford 1,2,3-trisubstituted indole derivatives.