Ambient temperatureruthenium‐catalyzedC−H arylations were accomplished by visiblelight without additional photocatalysts. The robustness of the ruthenium‐catalyzedC−H functionalization protocol was reflected by a broad range of sensitive functional groups and synthetically useful pyrazoles, triazoles and sensitive nucleosides and nucleotides, as well as multifold C−H functionalizations. Biscyclometalated
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.
C-Harylations were accomplished with a user-friendly heterogeneous palladium catalyst in the biomass-derived [gamma]-valerolactone (GVL) as an environmentally-benign reaction medium. The user-friendly protocol was characterized by ample substrate scope and...
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.
ChemoselectiveC−H arylations were accomplished through micellar catalysis by a versatile single‐component ruthenium catalyst. The strategy provided expedient access to C−H‐arylated ferrocenes with wide functional‐group tolerance and ample scope through weak chelation assistance. The sustainability of the C−H arylation was demonstrated by outstanding atom‐economy and recycling studies. Detailed computational