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。
Redox-Neutral Rhodium-Catalyzed CH Functionalization of Arylamine<i>N</i>-Oxides with Diazo Compounds: Primary C(sp<sup>3</sup>)H/C(sp<sup>2</sup>)H Activation and Oxygen-Atom Transfer
作者:Bing Zhou、Zhaoqiang Chen、Yaxi Yang、Wen Ai、Huanyu Tang、Yunxiang Wu、Weiliang Zhu、Yuanchao Li
DOI:10.1002/anie.201505302
日期:2015.10.5
1‐naphthylamine N‐oxides with diazo compounds was developed to afford various biologically important 1H‐benzo[g]indolines. This coupling reaction proceeds undermild reaction conditions and does not require external oxidants. The only by‐products are dinitrogen and water. More significantly, this reaction represents the first example of dual functiaonalization of unactivated a primary C(sp3)Hbond and C(sp2)H
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.
The mechanistic mode of oxidation of substituted n,n-dimethylanilines, thioanisoles, and methyl phenyl sulfoxides by 5-ethyl-4a-hydroperoxy-3-methyl-lumiflavin (4a-FlEt-OOH)
作者:Shigeru Oae、Kaoru Asada、Toshiaki Yoshimura
DOI:10.1016/s0040-4039(00)81631-7
日期:1983.1
In the oxidation of the title compounds, 5-ethyl-4a-hydroperoxy-3-methyl-lumiflavin (4a-FlEt-OOH), was found to be an electrophilic oxidant similar to m-chloroperoxybenzoic acid. However, the stereoselectivity of the oxidation of cyclic sulfides to the corresponding sulfoxides by 4a-FlEt-OOH was less pronounced than that of the oxygenation with flavin-containing monooxygenase.
<i>N</i>-Oxide as a Traceless Oxidizing Directing Group: Mild Rhodium(III)-Catalyzed CH Olefination for the Synthesis of<i>ortho</i>-Alkenylated Tertiary Anilines
作者:Xiaolei Huang、Jingsheng Huang、Chenglong Du、Xingyi Zhang、Feijie Song、Jingsong You
DOI:10.1002/anie.201307174
日期:2013.12.2
Double role: A traceless directinggroup also acts as an internal oxidant in a novel RhIII‐catalyzed protocol developed for the synthesis of ortho‐alkenylated tertiary anilines (see scheme). A five‐membered cyclometalated RhIII complex is proposed as a plausible intermediate and confirmed by X‐ray crystallographic analysis.