superacid catalyst system in Friedel–Crafts reactions is described. In the presence of PVP-TfOH, one pot solvent-free synthesis of a wide variety of diarylacetic acid derivatives was achieved by Friedel–Crafts hydroxyalkylation reaction of glyoxylic acid with arenes under mild conditions. Acylation of both activated and deactivatedaromaticcompounds with acetyl chloride was also achieved using PVP-TfOH complex
Silica sulfuric acid as a highly efficient catalyst for the synthesis of diarylacetic acids
作者:Desiree L. Moore、Allison E. Denton、Rose M. Kohinke、Brandon R. Craig、William E. Brenzovich
DOI:10.1080/00397911.2016.1158269
日期:2016.4.2
ABSTRACT An efficient heterogeneous method for the synthesis of diarylacetic acids was developed utilizing silica sulfuric acid as a catalyst. The reaction is highly efficient with a small amount of catalyst for the combination of a variety of electron-neutral to electron-rich arenes with glyoxylic acid. The reaction can also be utilized to synthesize unsymmetric derivatives from activated mandelic
Aromatic substituent effects in palladium-catalyzed intramolecular olefin oxyarylation reactions
作者:Mark C. Maust、Zacary L. Croft、Mackenzie W. Sullivan、Ross L. Dove、Emily E. Hardy、W.E. Brenzovich
DOI:10.1016/j.tetlet.2020.151674
日期:2020.3
The effect of electron-donating groups on the palladium-catalyzedintramolecular oxyarylation reaction was studied. In the case of activation at the ortho-position, the reaction favors the formation of a tricyclic lactone via C-H insertion. However, when the ipso-position is activated, the major product is instead a novel α,β-unsaturated lactone formed by way of a stabilized phenonium intermediate
Palladium‐Catalyzed Enantioselective Isodesmic C–H Iodination of Phenylacetic Weinreb Amides
作者:Hang Wang、Chunlin Zhou、Zezhong Gao、Shangda Li、Gang Li
DOI:10.1002/anie.202300905
日期:——
Isodesmic reactions represent mild alternatives to other chemical transformations that require harsh oxidizing agents or highly reactive intermediates. However, enantioselective isodesmic C−Hfunctionalization is unknown. Herein, an unprecedented highly enantioselective isodesmic C−Hfunctionalization to access chiral iodinated phenylacetic Weinrebamides via desymmetrization and kinetic resolution