Cationic Cobalt(III) Catalyzed Indole Synthesis: The Regioselective Intermolecular Cyclization of N-Nitrosoanilines and Alkynes
作者:Yujie Liang、Ning Jiao
DOI:10.1002/anie.201511002
日期:2016.3.14
regioselectivity and reactivity of cobalt(III) in the direct cyclization of N‐nitrosoanilines with alkynes for the expedient synthesis of N‐substituted indoles is demonstrated. In the presence of a cobalt(III) catalyst, high regioselectivity was observed when using unsymmetrical meta‐substituted N‐nitrosoanilines. Moreover, internal alkynes bearing electron‐deficient groups, which are almost unreactive
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。
Divergent C–H activation synthesis of chalcones, quinolones and indoles
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
One-Pot Tandem <i>ortho</i>-Naphthoquinone-Catalyzed Aerobic Nitrosation of <i>N</i>-Alkylanilines and Rh(III)-Catalyzed C–H Functionalization Sequence to Indole and Aniline Derivatives
作者:Tengda Si、Hun Young Kim、Kyungsoo Oh
DOI:10.1021/acs.joc.0c02776
日期:2021.1.1
The nitroso group served as a traceless directing group for the C–H functionalization of N-alkylanilines, ultimately removed after functioning either as an internal oxidant or under subsequent reducing conditions. The unique ability of o-NQ catalysts to aerobically oxidize the N-alkylanilines without using solvents and stoichiometric amounts of oxidants has rendered the new opportunity to develop the
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。
Co(III)-Catalyzed, Internal and Terminal Alkyne-Compatible Synthesis of Indoles
Co(III)-catalyzed, internal and terminal alkyne-compatible indole synthesis protocol is reported herein. The N-amino (hydrazine) group imparts distinct, diverse reactivity patterns for directed C–H functionalization/cyclization reactions. Notable synthetic features include regioselectivity for a meta-substituted arylhydrazine, regioselectivity for a chain-branched terminalalkyne, formal incorporation of