Late‐Stage Amination of Drug‐Like Benzoic Acids: Access to Anilines and Drug Conjugates through Directed Iridium‐Catalyzed C−H Activation
作者:Erik Weis、Magnus J. Johansson、Belén Martín‐Matute
DOI:10.1002/chem.202103510
日期:2021.12.23
Added at the eleventh hour: A method for the late-stage directed amination of benzoicacids is presented. It allows rapid access to both small amino-functionalized analogues and large conjugates, including PROTACs, peptide conjugates and probes for chemical biology. Selection of the right catalyst and reagent enabled the use of high-throughput experimentation and automation.
Ru-Catalyzed (<i>E</i>)-Specific <i>ortho</i>-C–H Alkenylation of Arenecarboxylic Acids by Coupling with Alkenyl Bromides
作者:Zhiyong Hu、Florian Belitz、Guodong Zhang、Florian Papp、Lukas J. Gooßen
DOI:10.1021/acs.orglett.1c00956
日期:2021.5.7
alkenyl bromides, (E)-configured vinyl arenes or dienes are formed exclusively. Mechanistic studies show that this selectivity is achieved because the (E)-configured alkenyl bromides undergo a smooth coupling, whereas the (Z)-isomers are rapidly eliminated with the formation of alkynes.
Ruthenium(IV) complexes were identified as key intermediates of C−H/O−H activations by weak O‐coordination. Thus, the annulations of sulfoxonium ylides by benzoic acids provided expedient access to diversely‐decorated isocoumarins with ample scope. Detailed experimental and computational studies provided strong support for a facile BIES‐C−Hactivation, along with cyclometalated ruthenium(IV) intermediates
A Protocol for the <i>Ortho</i>-Deuteration of Acidic Aromatic Compounds in D<sub>2</sub>O Catalyzed by Cationic Rh<sup>III</sup>
作者:Alyssa L. Garreau、Hanyang Zhou、Michael C. Young
DOI:10.1021/acs.orglett.9b02618
日期:2019.9.6
catalytically introduce deuterium in synthetically useful yields ortho to a carboxylic acid directing group on arenes typically requires D2 or high catalyst loadings, which makes using these approaches cost prohibitive for large-scale synthesis (equipment and reagent costs respectively). Herein, we present a simplified approach using low catalyst loadings of cationic RhIII and D2O as both deuterium source and solvent
2,2′-Biaryldicarboxylate Synthesis via Electrocatalytic Dehydrogenative C–H/C–H Coupling of Benzoic Acids
作者:Zhongyi Zeng、Jonas F. Goebel、Xianming Liu、Lukas J. Gooßen
DOI:10.1021/acscatal.1c01127
日期:2021.6.4
catalysts. These compounds have been found to be conveniently accessible from benzoicacidsvia Rh-catalyzed electrooxidative C–H/C–H couplings, giving valuable dihydrogen as the byproduct. In an undivided cell with Pt electrodes, RhCl3·3H2O catalyzes the oxidative carboxylate-directed ortho-homocoupling of various aromatic acids with a current efficiency of 67%. The protocol is operationally simple, tolerates