Synthesis of Unsymmetrical Arylheteroarylmethanes by Direct “On Water” Cross-Coupling between Benzylic and Heteroaromatic Halides
作者:Valeria Krasovskaya、Arkady Krasovskiy、Bruce H. Lipshutz
DOI:10.1002/asia.201100153
日期:2011.8.1
Walking on water: Pharmacologically important unsymmetricalarylheteroarylmethanes are prepared by simple palladium‐catalyzed zinc‐mediated Negishi‐like cross‐couplings in good yields. This reaction tolerates various benzylic chlorides and heteroaromatic bromides “on water” and at room temperature.
Generation of Dimethyl Sulfoxide Coordinated Thermally Stable Halogen Cation Pools for C−H Halogenation
作者:Pallaba Ganjan Dalai、Kuntal Palit、Niranjan Panda
DOI:10.1002/adsc.202101291
日期:2022.3
A method to generate halogen cation pools from the reaction of 1,2-dihaloethanes (hal=Br, I) and dimethyl sulfoxide (DMSO) for C−H halogenation of arenes and heteroarenes was reported. The initial reaction of DMSO and 1,2-dihaloethane generates the sulfur ylide, which undergoes pyrolytic elimination of ethylene by affording halonium ions. These ions were accumulated and stabilized by DMSO through coordination
Selective Oxidation of Clopidogrel by Peroxymonosulfate (PMS) and Sodium Halide (NaX) System: An NMR Study
作者:Everaldo F. Krake、Wolfgang Baumann
DOI:10.3390/molecules26195921
日期:——
A selective transformation of clopidogrel hydrogen sulfate (CLP) by reactivehalogen species (HOX) generated from peroxymonosulfate (PMS) and sodium halide (NaX) is described. Other sustainable oxidants as well as different solvents have also been investigated. As result of this study, for each sodium salt the reaction conditions were optimized, and four different degradation products were formed.