1024669-94-0Relevant academic research and scientific papers
Rhodium-catalysed: Ortho -alkynylation of nitroarenes
Echavarren, Antonio M.,García-Morales, Cristina,Mayans, Joan Guillem,Montesinos-Magraner, Marc,Tan, Eric
, p. 14731 - 14739 (2021/12/02)
The ortho-alkynylation of nitro-(hetero)arenes takes place in the presence of a Rh(iii) catalyst to deliver a wide variety of alkynylated nitroarenes regioselectively. These interesting products could be further derivatized by selective reduction of the nitro group or palladium-catalysed couplings. Experimental and computational mechanistic studies demonstrate that the reaction proceeds via a turnover-limiting electrophilic C-H metalation ortho to the strongly electron-withdrawing nitro group. This journal is
Dual Gold-Catalyzed Formal Tetradehydro-Diels–Alder Reactions for the Synthesis of Carbazoles and Indolines
Wang, Hong-Fa,Wang, Shi-Yue,Qin, Tian-Zhu,Zi, Weiwei
supporting information, p. 17911 - 17914 (2018/11/23)
This work reports a dual gold-catalyzed tetradehydro-Diels–Alder reaction for the synthesis of nitrogen-containing aromatic heterocycles. Under the catalytic system (IPrAuNTf2/DIPEA), indolines and carbazoles as well as other N-containing aromatic heterocycles were prepared in high yields with good functional group tolerance. Unlike the traditional thermal tetradehydro-Diels–Alder reactions, diluted reaction concentration and radical prohibitors are not required for this protocol. Experimental data support a mechanism involving gold vinylidene species, which undergoes a 6 π electrocyclization, followed with 1,2-hydrogen shift.
Rhodium-Catalyzed Cycloisomerization of 2-Silylethynyl Phenols and Anilines via 1,2-Silicon Migration
Kanno, Hiroshi,Nakamura, Kyosuke,Noguchi, Keiichi,Shibata, Yu,Tanaka, Ken
supporting information, p. 1654 - 1657 (2016/04/26)
It has been established that a cationic rhodium(I)/BINAP complex catalyzes the cycloisomerization of 2-silylethynylphenols, leading to 3-silylbenzofurans, via 1,2-silicon migration. Similarly, the cycloisomerization of 2-silylethynylanilines, leading to 3-silylindoles, via 1,2-silicon migration was catalyzed by a cationic rhodium(I)/H8-BINAP complex.
Scope and limitations of a DMF bio-alternative within Sonogashira cross-coupling and Cacchi-type annulation
Wilson, Kirsty L.,Kennedy, Alan R.,Murray, Jane,Greatrex, Ben,Jamieson, Craig,Watson, Allan J. B.
supporting information, p. 2005 - 2011 (2016/10/05)
Pd-catalysed C-C bond formation is an essential tool within the pharmaceutical and agrochemical industries. Many of these reactions rely heavily on polar aprotic solvents; however, despite their utility, these solvents are incompatible with the drive towards more sustainable chemical synthesis. Herein, we describe the scope and limitations of an alternative to DMF derived from renewable sources (Cyrene) in Sonogashira cross-coupling and Cacchi-type annulations.
An Exclusively trans-Selective Chlorocarbamoylation of Alkynes Enabled by a Palladium/Phosphaadamantane Catalyst
Le, Christine M.,Hou, Xiao,Sperger, Theresa,Schoenebeck, Franziska,Lautens, Mark
supporting information, p. 15897 - 15900 (2016/01/28)
Pharmaceutically relevant methylene oxindoles are synthesized by a palladium(0)-catalyzed intramolecular chlorocarbamoylation reaction of alkynes. A relatively underexplored class of caged phosphine ligands is uniquely suited for this transformation, enab
Palladium-catalyzed intermolecular aerobic oxidative cyclization of 2-ethynylanilines with isocyanides: Regioselective synthesis of 4-halo-2-aminoquinolines
Liu, Bifu,Gao, Hanling,Yu, Yue,Wu, Wanqing,Jiang, Huanfeng
supporting information, p. 10319 - 10328 (2013/11/06)
A robust and regioselective palladium-catalyzed intermolecular aerobic oxidative cyclization of 2-ethynylanilines with isocyanides to the synthesis of 4-halo-2-aminoquinolines is reported herein. The procedure constructs various 4-halo-2-aminoquinolines w
Synthesis of carbazoles by dehydro Diels-Alder reactions of ynamides
Martínez-Esperón, M. Fernanda,Rodríguez, David,Castedo, Luis,Saá, Carlos
, p. 3674 - 3686 (2008/09/19)
A new approach to carbazoles and benzannulated carbazoles by means of intramolecular dehydro Diels-Alder of ynamides is reported. N-(o-Ethynyl)aryl ynamides and N-(o-ethynyl) arylynamides were prepared in a few steps starting from o-iodoaniline. Thermal c
