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 Quinazolin-4(3<i>H</i>)-ones via Pd(II)-Catalyzed Intramolecular C(sp<sup>2</sup>)–H Carboxamidation of <i>N</i>-arylamidines
作者:Bin Ma、Yong Wang、Jiangling Peng、Qiang Zhu
DOI:10.1021/jo2007362
日期:2011.8.5
An efficient synthesis of quinazolin-4(3H)-ones from N-arylamidines, through palladium-catalyzed intramolecular C(sp(2))-H carboxamidation, has been developed. The reaction, carried out in the presence of 1.0 equiv of CuO as oxidant under atmospheric pressure of CO, provides diversified 2-aryl(alkyl)-quinazolin-4(3H)-ones in reasonable to good yields from N-arylamidines, which are readily derived from anilines and nitriles. Compared with existing approaches to quinazolin-4(3H)-ones, the current strategy features atom-economy and step-efficiency.
Palladium-Catalyzed Intramolecular C(sp<sup>2</sup>)–H Amidination by Isonitrile Insertion Provides Direct Access to 4-Aminoquinazolines from <i>N</i>-Arylamidines
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.
Vinylene carbonate: beyond the ethyne surrogate in rhodium-catalyzed annulation with amidines toward 4-methylquinazolines