developed for the hydroamination of alkynes by 1,1-disubstituted hydrazines. The catalyses are facile with terminal alkynes and some internal alkynes. If the hydrazine bears an aryl group, Fischer cyclization can occur in a one-pot procedure. In addition, reactions with acetylene to produce a plethora of hydrazones are described. Catalytic reactions involving acetylene and substituted hydrazines are complete
Traceless Directing Strategy: Efficient Synthesis of N-Alkyl Indoles via Redox-Neutral C–H Activation
作者:Chengming Wang、Yong Huang
DOI:10.1021/ol402523x
日期:2013.10.18
general protocol for the synthesis of N-alkyl indoles has been developed via a redoxneutral C–H activation strategy using a traceless nitroso directinggroup. A broad scope of substituted N-alkyl indoles has been prepared in good to excellent yields using a very simple Rh catalyst system in the absence of an external oxidant or any other additive. Good to excellent regioselectivity has been achieved for
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。
Rhodium(<scp>iii</scp>)-catalyzed indole synthesis at room temperature using the transient oxidizing directing group strategy
作者:Yaping Shang、Krishna Jonnada、Subhash Laxman Yedage、Hua Tu、Xiaofeng Zhang、Xin Lou、Shijun Huang、Weiping Su
DOI:10.1039/c9cc04529e
日期:——
temperature have been developed using an in situ generated N-nitroso group as a transient oxidizing directinggroup. Due to mild reaction conditions, this method enabled synthesis of a broad range of N-alkyl indoles, including even two indole-based medicinal compounds. Our work disclosed the feasibility of the transient oxidizing directinggroup strategy in C–H functionalization reactions, which possesses
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