Palladium-Catalyzed Direct Arylations of 1,2,3-Triazoles with Aryl Chlorides using Conventional Heating
作者:Lutz Ackermann、Rubén Vicente、Robert Born
DOI:10.1002/adsc.200800016
日期:2008.3.25
Generally applicable, palladium-catalyzeddirectarylations of 1,2,3-triazoles with aryl chlorides were accomplished through conventional heating at reaction temperatures of 105–120 °C. Thereby, intra- and intermolecular CH bond functionalizations were achieved with a variety of differently substituted chlorides as electrophiles, bearing numerous valuable functional groups.
Direct C-H Arylation of Heteroarenes with Aryl Chlorides by Using an Abnormal N-Heterocyclic-Carbene-Palladium Catalyst
作者:Jasimuddin Ahmed、Samaresh Chandra Sau、Sreejyothi P、Pradip Kumar Hota、Pavan K. Vardhanapu、Gonela Vijaykumar、Swadhin K. Mandal
DOI:10.1002/ejoc.201601218
日期:2017.2.3
Herein, we report a versatilecatalyticsystem for the direct C–H arylation of heteroarenes with activated arylchloride substrates. The catalyst works successfully for a variety of heteroarenes and arylchloride coupling partners under very low catalyst-loading conditions. We have successfully performed the direct C–H arylations of 1-methylpyrrole, 1-methylindole, furan, thiophene, furfural, and N-benzyl-1
Catalytic Direct Arylations in Polyethylene Glycol (PEG): Recyclable Palladium(0) Catalyst for C−H Bond Cleavages in the Presence of Air
作者:Lutz Ackermann、Rubén Vicente
DOI:10.1021/ol9020354
日期:2009.11.5
Two protocols for ruthenium- or palladium-catalyzed direct arylations in user-friendly polyethylene glycol (PEG) were devised, which set the stage for the development of user-friendly palladium(0)-catalyzedC−H bond functionalizations in the presence of air with a recyclable phosphine ligand-free palladium complex.
A Cu/Pd-catalyzed, three-component click reaction of azide, alkyne, and aryl halide has been developed. By using this Cu/Pd transmetalation relay catalysis, a variety of 1,4,5-trisubstituted 1,2,3-triazoles were quickly assembled in one step in high yields with complete regioselectivity, just like assembling Lego bricks. Notably, different from the well-established CuAAC click reactions only working on terminal alkynes, this reaction offers an alternative solution for the problem of the click reaction of internal alkynes.