Rhodium-Catalyzed CH Annulation of Nitrones with Alkynes: A Regiospecific Route to Unsymmetrical 2,3-Diaryl-Substituted Indoles
作者:Hao Yan、Haolong Wang、Xincheng Li、Xiaoyi Xin、Chunxiang Wang、Boshun Wan
DOI:10.1002/anie.201503997
日期:2015.9.1
of anilines or related compounds with internal alkynes provides straightforward access to 2,3‐disubstituted indole products. However, this transformation proceeds with poor regioselectivity in the synthesis of unsymmetrically 2,3‐diaryl substituted indoles. Herein, we report the rhodium(III)‐catalyzed CH annulation of nitrones with symmetrical diaryl alkynes as an alternative method to prepare 2,
A Highly Selective Tandem Cross-Coupling of <i>gem</i>-Dihaloolefins for a Modular, Efficient Synthesis of Highly Functionalized Indoles
作者:Yuan-Qing Fang、Mark Lautens
DOI:10.1021/jo701987r
日期:2008.1.1
A highly efficient method of indole synthesis using gem-dihalovinylaniline substrates and an organoboron reagent was developed via a Pd-catalyzed tandem intramolecularamination and an intermolecular Suzuki coupling. Aryl, alkenyl, and alkyl boron reagents are all successfully employed, making for a versatile modular approach. The reaction tolerates a variety of substitution patterns on the aniline
Transition-metal-free, visible-light induced cyclization of arylsulfonyl chlorides with o-azidoarylalkynes: a regiospecific route to unsymmetrical 2,3-disubstituted indoles
作者:Lijun Gu、Cheng Jin、Wei Wang、Yonghui He、Guangyu Yang、Ganpeng Li
DOI:10.1039/c6cc10305g
日期:——
A visible-light-catalyzed synthesis of unsymmetrical 2,3-diaryl-substituted indoles from arylsulfonyl chlorides and o-azidoarylalkynes at room temperature has been discovered. This transformation exhibits excellent substrate scope and functional group tolerance. The use of inexpensive eosin Y as the catalyst with easy operation makes this protocol very practical.
Palladium-Catalyzed Reaction of Arylamine and Diarylacetylene: Solvent-Controlled Construction of 2,3-Diarylindoles and Pentaarylpyrroles
作者:Xiaopeng Chen、Xihui Li、Ningning Wang、Jisong Jin、Ping Lu、Yanguang Wang
DOI:10.1002/ejoc.201200531
日期:2012.8
By choosing DMF and dioxane as solvent, skeletons of indoles and pyrroles were constructed from alkynes and amines in the presence of PdCl2, respectively. These Pd-catalyzed reactions were phosphane-free with high atom efficiency and could be conducted under mild basic conditions. The proposed mechanism for the selective formation of indoles and pyrroles in different solvents is also discussed in this
Heterogeneous Palladium Catalysts Applied to the Synthesis of 2- and 2,3-Functionalised Indoles
作者:Laurent Djakovitch、Véronique Dufaud、Rabah Zaidi
DOI:10.1002/adsc.200505283
日期:2006.4
Heterogeneouspalladiumcatalysts ([Pd(NH3)4]2+/NaY and [Pd]/SBA-15) were applied to the synthesis of 2-functionalised indoles, giving generally high conversions and selectivities (>89% yield) using only 1 mol % [Pd]-catalyst under standard reaction conditions (polar solvent, 80 °C). For the synthesis of 2,3-functionalisedindoles by cross-coupling arylation, the [Pd]/SBA-15 catalyst was found to be