Flow microreactors have allowed an efficient extended Pummerer reaction of ketene dithioacetal monoxides with anilines by precise control of unstable sulfonium intermediates and spatial separation ...
Palladium-Catalyzed Intermolecular Alkene Carboacylation via Ester C–O Bond Activation
作者:Haley K. Banovetz、Kevin L. Vickerman、Colton M. David、Melisa Alkan、Levi M. Stanley
DOI:10.1021/acs.orglett.1c00940
日期:2021.5.7
We report palladium-catalyzed intermolecular carboacylation of alkenes with ester electrophiles and tetraarylborate nucleophiles. Bicyclic alkenes react with a variety of pentafluorophenyl benzoate and alkanoate esters and sodium tetraarylborates to form ketone products in ≤99% yields. These reactions occur in the absence of a directing group and demonstrate esters are competent acyl electrophiles
Palladium-Catalyzed Room-Temperature Acylative Suzuki Coupling of High-Order Aryl Borons with Carboxylic Acids
作者:Shufen Si、Chen Wang、Nan Zhang、Gang Zou
DOI:10.1021/acs.joc.6b00421
日期:2016.5.20
Pd(OAc)2/PPh3-catalyzed acylative Suzukicoupling of carboxylic acids with diarylborinic acids or tetraarylboronates for practical and efficient synthesis of sterically undemanding aryl ketones at room temperature. More than just cost-effective alternatives to aryl boronicacids, diarylborinic acids and tetraarylboronates displayed higher reactivity in the acylative Suzukicoupling. A variety of alkyl aryl
Regioselective Synthesis of β-Aryl- and β-Amino-Substituted Aliphatic Esters by Rhodium-Catalyzed Tandem Double-Bond Migration/Conjugate Addition
作者:Dominik M. Ohlmann、Lukas J. Gooßen、Markus Dierker
DOI:10.1002/chem.201100654
日期:2011.8.16
unsaturated esters. Once the double‐bond is in conjugation with the carboxylate group, they also catalyze the Michael addition of carbon and nitrogen nucleophiles. In the presence of these catalysts, unsaturated carboxylates enter a dynamic equilibrium of positional and geometrical double‐bond isomers. The conjugated species are continuously removed through 1,4‐additions with formation of β‐amino esters or