A new approach to isoindolinone derivatives by sequential palladium iodide-catalyzed oxidative aminocarbonylation–heterocyclization of 2-ethynylbenzamides
A novel approach to functionalized isoindolinone derivatives 3 is presented. It is based on a cascade process, consisting of PdI2/KI-catalyzed oxidative monoaminocarbonylation of secondary 2-ethynylbenzamides 1 with nucleophilic secondary amines 2, followed by intramolecular conjugate addition of the arylamido group to the alkynylamido group of the intermediate alkynylamides. Products have been obtained in high to excellent yields starting from different N-alkyl 2-ethynylbenzamides and amines, under relatively mild conditions (100 degrees C under 40 atm of a 4:1 mixture of CO-air), working in a MeCN-amine mixture (2:1, v/v) for 5-15 h. (C) 2012 Elsevier Ltd. All rights reserved.
Divergent Palladium Iodide Catalyzed Multicomponent Carbonylative Approaches to Functionalized Isoindolinone and Isobenzofuranimine Derivatives
作者:Raffaella Mancuso、Ida Ziccarelli、Donatella Armentano、Nadia Marino、Salvatore V. Giofrè、Bartolo Gabriele
DOI:10.1021/jo500281h
日期:2014.4.18
formation of 3-[(dialkylcarbamoyl)methylene]isoindolin-1-ones through the intermediate formation of the corresponding 2-ynamide derivatives followed by intramolecular nucleophilic attack by the nitrogen of the benzamide moiety on the conjugated triple bond. On the other hand, 3-[(alkoxycarbonyl)methylene]isobenzofuran-1(3H)imines were selectively obtained when the oxidative carbonylation of 2-alkynylbenzamides