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,
Rhodium-Catalyzed Synthesis of 2,3-Disubstituted Indoles from β,β-Disubstituted Stryryl Azides
作者:Ke Sun、Sheng Liu、Patryk M. Bec、Tom G. Driver
DOI:10.1002/anie.201006917
日期:2011.2.11
Rings à la carte: Rhodium carboxylate complexes catalyze selective cascade reactions to produce a range 2,3‐disubstituted indolesfromβ,β‐disubstituted stryrylazides. The selective migration of aryl groups appears to originate from a putative phenonium ion reactive intermediate (see scheme).
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
Pd immobilized on EDTA-modified cellulose: synthesis, characterization, and catalytic application in inter- and intramolecular Heck reactions and Larock reactions
作者:Zhian Xu、Jinxi Xu、Yuping Zhou、Yuling Huang、Yiqun Li
DOI:10.1007/s11164-022-04766-x
日期:2022.8
regulation of multidentate sites of EDTA, the immobilized Pd exhibited high catalytic activity in the inter- and intramolecular Heck reactions and heteroannulation Larock reactions to afford the desired products in excellent yields (66–97%). The catalyst recycling experiments for the model Heck reaction showed that the catalyst can be reused at least four consecutive runs with a slight drop in its catalytic
A new method for the generation of 1,5-dipoles from o-stannylmethylated thioanilides via 1,6-stannatropy under neutral conditions was developed. Cyclization of the 1,5-dipoles afforded indole derivatives effectively. The strategy has potential for application to the generation of alternative 1,5-dipoles from o-stannylmethylated aryl isothiocyanates leading to indole derivatives having a stannylthio group that was readily converted to other functional groups.