We report a novel and practical one-pot Rh(III)-catalyzed strategy to construct benzimidazo[1,2-a]quinolines from readily available imidamides and anthranils. The cascade reaction proceeds via a C-H amination-cyclization-cyclization process in ionic liquid without any additives and possesses simple operation, moderate-to-high yield, and broad substrate scope features, which will provide the reference
Synthesis of indoles and quinazolines <i>via</i> additive-controlled selective C–H activation/annulation of <i>N</i>-arylamidines and sulfoxonium ylides
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.