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,
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.
Iridium‐Catalyzed Oxidative Annulation of 2‐Arylindoles with Benzoquinone Leading to Indolo[1,2‐
<i>f</i>
]phenanthridin‐6‐ols
作者:Shenghai Guo、Yangfan Liu、Xinying Zhang、Xuesen Fan
DOI:10.1002/adsc.202000449
日期:2020.7.29
An iridium‐catalyzedoxidative [4+2] annulation reaction of 2‐arylindoles using quinone derivatives as C2 synthons has been developed. From this reaction, a series of diversely substituted indolo[1,2‐f ]phenanthridine derivatives were synthesized in an efficient manner. Moreover, diverse transformations of the phenanthridine derivatives thus obtained have also been performed, which showcase the synthetic
已经开发了使用醌衍生物作为C2合成子的2-芳基吲哚的铱催化的[4 + 2]氧化环化反应。通过该反应,可以有效地合成一系列不同取代的吲哚[1,2- f ]菲啶衍生物。此外,还进行了由此获得的菲啶衍生物的各种转化,这证明了本方案的合成潜力。
Titanium-induced syntheses of furans, benzofurans and indoles
作者:Alois Fürstner、Denis N. Jumbam
DOI:10.1016/s0040-4020(01)89848-3
日期:1992.1
Highly reactive titanium on graphite as the reagent of choice promotes intramolecular McMurry type reactions of acyloxy- and acylamido carbonyl compounds affording furans, benzofurans and indoles in good to excellent yields. A variety of reducible groups in the substrates is tolerated (e.g. -F, -Cl, -Br, -I, -CF3, -OMe, -CN, -thiophenyl, -COOR, -CONR2) and strained products such as 11h can be obtained
Transition-metal-free, visible-light-mediated cyclization of <i>o</i>-azidoarylalkynes with aryl diazonium salts
作者:Cheng Jin、Lianzheng Su、Daxi Ma、Mingrong Cheng
DOI:10.1039/c7nj03144k
日期:——
Visible light along with 3 mol% eosinYcatalyzes the cyclization reaction of o-azidoarylalkynes with aryl diazonium salts by a photoredox process. We have investigated the scope of the reaction for several aryl diazonium salts and o-azidoarylalkynes. The general and easy procedure provides a transition-metal-free alternative for the formation of unsymmetrical 2,3-diaryl-substitued indoles.