Mild and Efficient Palladium-Catalyzed Direct Trifluoroethylation of Aromatic Systems by C−H Activation
作者:Balázs L. Tóth、Szabolcs Kovács、Gergő Sályi、Zoltán Novák
DOI:10.1002/anie.201510555
日期:2016.2.5
With the utilization of a highly active trifluoroethyl(mesityl)iodonium salt, the developed catalytic method enables the first highlyefficient and selective trifluoroethylation of aromaticcompounds. The robust catalytic procedure provides the desired products in up to 95 % yield at 25 °C in 1.5 to 3 hours and tolerates a broad range of functional groups. The utilization of hypervalent reagents opens
Green alternative solvents for the copper-catalysed arylation of phenols and amides
作者:Carlo Sambiagio、Rachel H. Munday、A. John Blacker、Stephen P. Marsden、Patrick C. McGowan
DOI:10.1039/c6ra02265k
日期:——
for the Cu-catalysed arylation of phenols and amides is reported. Alkyl acetates proved to be efficient solvents in the catalytic processes, and therefore excellent alternatives to the typical non-green solvents used for Cu-catalysed arylationreactions. Solvents such as isosorbide dimethyl ether (DMI) and diethyl carbonate also appear to be viable possibilities for the arylation of phenols. Finally
Rhodium-Catalyzed Addition of Organozinc Iodides to Carbon-11 Isocyanates
作者:Braeden A. Mair、Moustafa H. Fouad、Uzair S. Ismailani、Maxime Munch、Benjamin H. Rotstein
DOI:10.1021/acs.orglett.0c00729
日期:2020.4.3
Amides were prepared using rhodium-catalyzed coupling of organozinc iodides and carbon-11 (11C, t1/2 = 20.4 min) isocyanates. Nonradioactive isocyanates and sp3 or sp2 organozinc iodides generated amides in yields of 13%–87%. Incorporation of cyclotron-produced [11C]CO2 into 11C-amide products proceeded in yields of 5%–99%. The synthetic utility of the methodology was demonstrated through the isolation
Structural Studies on Bioactive Compounds. 23. Synthesis of Polyhydroxylated 2-Phenylbenzothiazoles and a Comparison of their Cytotoxicities and Pharmacological Properties with Genistein and Quercetin
作者:Malcolm F. G. Stevens、Carol J. McCall、Peter Lelievald、Peter Alexander、Audrey Richter、Donna E. Davies
DOI:10.1021/jm00037a020
日期:1994.5
receptor tyrosine kinase or the PDGF receptor tyrosine kinase in a standard mitogenesis assay utilizing human fibroblasts, no discrimination was observed. In this assay, the compounds inhibited DNA synthesis when added to cells during S phase. This suggests that inhibition could not be interpreted in terms of tyrosine kinase inactivation but more likely as a relatively broad specificity for the ATP-binding
Palladium-Imidazolium<i>N</i>-Heterocyclic Carbene-Catalyzed Carbonylative Amidation With Boronic Acids, Aryl Diazonium Ions, and Ammonia
作者:Merritt B. Andrus、Yudao Ma、Chun Song、Qiang Chai、Changqin Ma
DOI:10.1055/s-2003-42478
日期:——
tetrafluoroborates have been coupled with arylboron compounds, carbon monoxide, and ammonia to give aryl amides in high yields. A saturated N-heterocyclic carbene (NHC) ligand, H 2 IPr was used with palladium(II) acetate to give the active catalyst. A mechanism is proposed for this novel four-component couplingreaction.
芳基重氮四氟硼酸盐已与芳基硼化合物、一氧化碳和氨偶联,以高收率得到芳基酰胺。将饱和的 N-杂环卡宾 (NHC) 配体 H 2 IPr 与乙酸钯 (II) 一起使用以得到活性催化剂。为这种新颖的四组分偶联反应提出了一种机制。