A copper-mediated 2,3-difunctionalization of indoles to afford 3-halogenated 2,3′-biindoles is described herein. The protocol uses readily available feedstocks and a naturally abundant copper catalyst system, which allows the regioselective formation of C–C and C–X (X = Cl & Br) bonds in one single operation. Here the copper metal salt serves not only as a catalyst but also as a reactant to provide
Iodine-Catalyzed Aerobic Diazenylation–Amination of Indole Derivatives
作者:Saibal Sar、Ankita Tripathi、Kshatresh Dutta Dubey、Subhabrata Sen
DOI:10.1021/acs.joc.9b03392
日期:2020.3.6
A mild strategy for consecutive diazenylation and amination of indole moieties has been demonstrated. The functionalization occurs at C3 and C2 carbon atoms, respectively, at the indole scaffold in the presence of catalytic iodine and air at 40 °C in the 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) solvent. It is noteworthy that the aromatic amines are generated in situ by the reaction of aryl hydrazine
Cu(I)-Catalyzed Enantioselective Friedel–Crafts Alkylation of Indoles with 2-Aryl-<i>N</i>-sulfonylaziridines as Alkylating Agents
作者:Chen Ge、Ren-Rong Liu、Jian-Rong Gao、Yi-Xia Jia
DOI:10.1021/acs.orglett.6b01317
日期:2016.7.1
A highlyenantioselectiveFriedel–Craftsalkylation of indoles with N-sulfonylaziridines as alkylating agents has been developed by utilizing the complex of Cu(CH3CN)4BF4/(S)-Segphos as a catalyst. A range of optically active tryptamine derivatives are obtained in good to excellent yields and enantioselectivities (up to >99% ee) via a kinetic resolution process.
Ruthenium-Catalyzed Sequential Hydrosilylation/Dehydrogenation and C–H Silylation: Synthesis of Six-Membered Indole Silacycles and Pyrrole Silyl Ether Cycles
作者:Jiefang Li、Shanshan Xu、Jieyu Liang、Juanjuan Zheng、Ping Li、Jun Wang、Bin Li
DOI:10.1021/acs.orglett.4c01949
日期:2024.7.26
Selective dehydrogenative C–H silylation is one of the most powerful tools to synthesize silacycles. Herein, we developed Ru-catalyzed sequential hydrosilylation/C–H silylation of allyl-indoles and dehydrogenative O–H/C–H silylation of pyrrole phenols. Both six-membered indole silacycles and pyrrole silyl ether cycles were successfully synthesized with good functional group tolerance. Furthermore,