铑(I)催化剂促进邻炔基苯酚和苯胺转化为相应的苯并[ b ]呋喃和吲哚。假定该反应通过过渡的3-铑杂环中间体进行,该中间体可以用合适的亲电试剂捕获以得到多取代的杂环。在单取代的吸电子亲电体的情况下,与Heck-Mizoroki反应相比,可以获得优异的收率和选择性。在2-炔基吡啶亲电试剂的情况下,形成新的2-(苯并呋喃-3-基)乙烯基吡啶。
An Iron-Catalyzed Bond-Making/Bond-Breaking Cascade Merges Cycloisomerization and Cross-Coupling Chemistry
作者:Pierre-Georges Echeverria、Alois Fürstner
DOI:10.1002/anie.201604531
日期:2016.9.5
reaction cascade that results in the net formation of two new C−C bonds while a C−Z bond in the substrate backbone is broken. Not only does this new manifold lend itself to the extrusion of heteroelements (Z=O, NR), but it can even be used for the cleavage of activatedC−C bonds. The reaction likely proceeds via metallacyclic intermediates, the iron center of which gains ate character before reductive elimination
Metal-Free Radical Annulation of Oxygen-Containing 1,7-Enynes: Configuration-Selective Synthesis of (<i>E</i>)-3-((Arylsulfonyl)methyl)-4-Substituted Arylidenechromene Derivatives
作者:Kaimin Mao、Mouwang Bian、Lei Dai、Jinghang Zhang、Qiuyu Yu、Chang Wang、Liangce Rong
DOI:10.1021/acs.orglett.0c03946
日期:2021.1.1
A novel strategy for the synthesis of (E)-3-((arylsulfonyl)methyl)-4-substituted benzylidenechromene derivatives via a metal-free radical annulation reaction of oxygen-containing 1,7-enynes with thiosulfonates has been developed. The reaction shows broad substrate scope, wide functional group tolerance, and moderate to excellent yields. Moreover, thiosulfonates were well driven to achieve the bifunctionalization
Rhodium-Catalyzed Intramolecular Transannulation Reaction of Alkynyl Thiadiazole Enabled 5,<i>n</i>-Fused Thiophenes
作者:Ji Eun Kim、Jinsub Lee、Hyunsik Yun、Yonghyeon Baek、Phil Ho Lee
DOI:10.1021/acs.joc.6b02614
日期:2017.2.3
of a wide range of fused thiophenes, including those fused with lactams, lactones, or cyclicethers, was developed from a rhodium-catalyzed intramolecular transannulation reaction of alkynyl thiadiazoles. This transannulation reaction provides an efficient platform for the construction of a variety of 5,n-fused thiophenes from readily available starting materials together with the release of molecular
Iridium(<scp>i</scp>)-catalyzed hydration/esterification of 2-alkynylphenols and carboxylic acids
作者:Linwei Zeng、Renjie Chen、Chen Zhang、Hujun Xie、Sunliang Cui
DOI:10.1039/c9cc09984k
日期:——
An iridium(i)-catalyzed hydration/esterification of 2-alkynylphenols and carboxylicacids is described. Various 2-alkynylphenols and carboxylicacids could be used in this process to furnish aromatic ortho-acyloxyketones via a regio- and stereo-selective addition reaction followed by intramolecular rearrangement. This protocol features mild reaction conditions and broad substrate scope. Further transformations
Rhodium(III)-Catalyzed Cascade Cyclization/Electrophilic Amidation for the Synthesis of 3-Amidoindoles and 3-Amidofurans
作者:Zhiyong Hu、Xiaofeng Tong、Guixia Liu
DOI:10.1021/acs.orglett.6b00689
日期:2016.5.6
A rhodium(III)-catalyzed cascade cyclization/electrophilic amidation using N-pivaloyloxylamides as the electrophilic nitrogen source has been developed. This protocol provides an efficient route for the synthesis of 3-amidoindoles and 3-amidofurans under mild conditions with good functional group tolerance. The synthetic utility of this reaction has been demonstrated through the derivatization of the