Palladium-Catalyzed Intramolecular C(sp2)–H Amidination by Isonitrile Insertion Provides Direct Access to 4-Aminoquinazolines from N-Arylamidines
摘要:
An efficient method for the synthesis of 4-amino-2-aryl(alkyl)quinazolines from readily available N-arylamidines and isonitriles via palladium-catalyzed intramolecular aryl C-H amidination by isonitrile insertion has been developed.
Synthesis of 4-Aminoquinazolines by Palladium-Catalyzed Intramolecular Imidoylation of N-(2-Bromoaryl)amidines
作者:Gitte Van Baelen、Sander Kuijer、Lukáš Rýček、Sergey Sergeyev、Elwin Janssen、Frans J. J. de Kanter、Bert U. W. Maes、Eelco Ruijter、Romano V. A. Orru
DOI:10.1002/chem.201102468
日期:2011.12.23
investigated the intramolecular imidoylative cross‐coupling of N‐(2‐bromoaryl)amidines, leading to 4‐aminoquinazolines. After thorough optimization of the reaction with respect to palladium source and loading, ligand, base, temperature, and solvent, a small library of 4‐aminoquinazolines was prepared to determine the scope of this method. Various substituents are tolerated on the amidine and the isocyanide
A Comparative Investigation: Group 9 Cp*M(III)-Catalyzed Formal [4 + 2] Cycloaddition as an Atom-Economic Approach to Quinazolines
作者:Xiaoming Wang、Andreas Lerchen、Frank Glorius
DOI:10.1021/acs.orglett.6b00716
日期:2016.5.6
A comparative study on the catalytic activity of different group 9 [Cp*M(III)] complexes in the formal [4 + 2] cycloaddition of arenes with rarely explored free imines and dioxazolones for the construction of multisubstituted quinazolines is reported herein. This investigation revealed that the cobalt catalyst is uniquely suited to this transformation due to its strong Lewis acidity and high sensitivity