Palladium-Catalyzed One-Pot Three- or Four-Component Coupling of Aryl Iodides, Alkynes, and Amines through CN Bond Cleavage: Efficient Synthesis of Indole Derivatives
作者:Wei Hao、Weizhi Geng、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1002/chem.201304215
日期:2014.2.24
An efficient synthesis of N‐substituted indolederivatives was realized by combining the Pd‐catalyzed one‐pot multicomponent coupling approach with cleavage of the C(sp3)N bonds. Three or four components of aryl iodides, alkynes, and amines were involved in this coupling process. The cyclopentadiene–phosphine ligand showed high efficiency. A variety of aryl iodides, including cyclic and acyclic tertiary
N-取代的吲哚衍生物的有效合成通过Pd催化的一锅多组分耦合方法与C(SP的切割组合实现3)N个债券。该偶联过程涉及芳基碘化物,炔烃和胺的三种或四种组分。环戊二烯-膦配体显示出高效率。可以使用多种芳基碘化物,包括环状和无环叔氨基芳基碘化物,以及取代的1-溴-2-碘代苯衍生物。可以使用被烷基,芳基或三甲基甲硅烷基取代的对称和不对称炔烃。环仲胺(例如哌啶,吗啉,4-甲基哌啶,1-甲基哌嗪,2-甲基哌啶)和无环胺(包括仲胺和伯胺)均显示出良好的反应性。苯并硅氧烷[2,3- b ]吲哚的合成证明了所得吲哚衍生物的进一步应用。
Rhodium(III)-Catalyzed Indole Synthesis Using N–N Bond as an Internal Oxidant
We report herein a Rh(III)-catalyzed cyclization of N-nitrosoanilines with alkynes for streamlined synthesis of indoles. The synthetic protocol features a distinct internal oxidant, N-N bond, as a reactive handle for catalyst turnover, as well as a hitherto tantalizingly elusive intermolecular redox-neutral manifold, predicated upon C-H activation, for the formation of a five-membered azaheterocycle
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
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
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