A novel iron-mediated direct C–H arylation of quinones and pyridine analogues with arylboronic acids has been developed using dichloromethane and water as solvents at ambient temperature. FeS is employed and serves as an efficient catalyst. A detailed reaction mechanism is speculated and expounded.
Direct Arylation of Substituted Pyridines with Arylboronic Acids Catalyzed by Iron(II) Oxalate
作者:Yibo Huang、Dan Guan、Liang Wang
DOI:10.1002/cjoc.201400528
日期:2014.12
The directarylation of substitutedpyridines with several arylboronicacids has been developed. This transformation could proceed readily at ambient temperature using inexpensive reagents: iron(II) oxalate as a catalyst, potassium persulfate as a co‐oxidant, which can afford the arylated products in mild to good yields. The mechanism is presumed to proceed through a nucleophilic radical addition to
Synthesis of Sterically Hindered Primary Amines by Concurrent Tandem Photoredox Catalysis
作者:Michael C. Nicastri、Dan Lehnherr、Yu-hong Lam、Daniel A. DiRocco、Tomislav Rovis
DOI:10.1021/jacs.9b10871
日期:2020.1.15
methodologies exist for amine synthesis, but the direct synthesis of primary amines with a fully substituted α carbon center is an underdeveloped area. We report a method which utilizes photoredox catalysis to couple readily available O-benzoyl oximes with cyanoarenes to synthesize primary amines with fully substituted α-carbons. We also demonstrate that this method enables the synthesis of amines with α-trifluoromethyl
Silver-Catalyzed Minisci Reactions Using Selectfluor as a Mild Oxidant
作者:Jordan D. Galloway、Duy N. Mai、Ryan D. Baxter
DOI:10.1021/acs.orglett.7b02706
日期:2017.11.3
A new method for silver-catalyzed Minisci reactions usingSelectfluor as a mild oxidant is reported. Heteroarenes and quinones both participate in radical C–H alkylation and arylation from a variety of carboxylic and boronic acid radical precursors. Several oxidatively sensitive and highly reactive radical species are successful, providing structures that are challenging to access by other means.
C−H Cyanation of 6-Ring N-Containing Heteroaromatics
作者:Bryony L. Elbert、Alistair J. M. Farley、Timothy W. Gorman、Tarn C. Johnson、Christophe Genicot、Bénédicte Lallemand、Patrick Pasau、Jakub Flasz、José L. Castro、Malcolm MacCoss、Robert S. Paton、Christopher J. Schofield、Martin D. Smith、Michael C. Willis、Darren J. Dixon
DOI:10.1002/chem.201703931
日期:2017.10.20
them have the potential for far‐reaching impact across synthetic chemistry and the biomedical sciences. Herein, we report an approach to heteroaromatic C−H cyanation through triflic anhydrideactivation, nucleophilicaddition of cyanide, followed by elimination of trifluoromethanesulfinate to regenerate the cyanated heteroaromatic ring. This one‐pot protocol is simple to perform, is applicable to a broad