Copper-Mediated Cyclization−Halogenation and Cyclization−Cyanation Reactions of β-Hydroxyalkynes and <i>o</i>-Alkynylphenols and Anilines
作者:Nalivela Kumara Swamy、Arife Yazici、Stephen G. Pyne
DOI:10.1021/jo1005119
日期:2010.5.21
The CuX (X = I, Br, Cl, CN)-mediated cyclization−halogenation and cyclization−cyanation reactions of β-hydroxyalkynes and o-alkynylphenol and -aniline derivatives give rise to 3-halo- and 3-cyanofuro[3,2-b]pyrroles, 3-iodo-, 3-bromo-, and 3-cyanobenzofurans, and 3-cyanoindoles, respectively.
CuX(X = I,Br,Cl,CN)介导的β-羟基炔烃与邻炔基苯酚和-苯胺衍生物的环化-卤化和环化-氰化反应生成3-卤代和3-氰基呋喃[3,2 - b ]吡咯,3-碘,3-溴-和3- cyanobenzofurans和3- cyanoindoles,分别。
Rh(III)-Catalyzed Asymmetric Synthesis of Axially Chiral Biindolyls by Merging C–H Activation and Nucleophilic Cyclization
作者:Miaomiao Tian、Dachang Bai、Guangfan Zheng、Junbiao Chang、Xingwei Li
DOI:10.1021/jacs.9b04711
日期:2019.6.19
herein is the mild and highly enantioselective synthesis of 2,3'-biindolyls via underexplored integration of C-Hactivation and alkyne cyclization using a unified chiral Rh(III) catalyst. The reaction proceeded via initial C-Hactivation followed by alkyne cyclization. A chiral rhodacyclic intermediate has been isolated from stoichiometric C-Hactivation, which offers direct mechanistic insight.
Accessing Unsymmetrically Linked Heterocycles through Stereoselective Palladium‐Catalyzed Domino Cyclization
作者:Ramon Arora、José F. Rodríguez、Andrew Whyte、Mark Lautens
DOI:10.1002/anie.202112288
日期:2022.1.3
Solving alkynes of problems with palladium. A palladium-catalyzed dominocyclization of alkyne-tethered carbamoyl chlorides and aryl iodides with alkyne-tethered aryl nucleophiles is reported. This methodology unsymmetrically links heterocycles along a tetrasubstituted olefin with >20:1 E/Z selectivity and up to 96 % yield.
An electrochemical cascade process: synthesis of 3-selenylindoles from 2-alkynylanilines with diselenides
作者:Anil Balajirao Dapkekar、Gedu Satyanarayana
DOI:10.1039/d3cc02294c
日期:——
motifs in pharmaceutical molecules. Herein, we report a metal, oxidant, and base-free electrochemical approach to access 3-selenylindoles through an oxidative cyclization of 2-alkynylanilines with diselenides. This environmentally friendly approach demonstrates a wide range of substrate scope under mild reaction conditions in an electrochemical undivided cell setup.
photoinduced radical cascade cyclization of alkynes with sulfinates via a novel EDA complex for the synthesis of various 3-sulfonylindoles and vinylsulfone oxindoles, which are crucial motifs in medicinal and biological chemistry. The reaction proceeds under mild, photocatalyst- and transition-metal-free conditions, featuring operational simplicity, broad substrate scope, and easy scalability. Mechanistic