Solvent/Oxidant-Switchable Synthesis of Multisubstituted Quinazolines and Benzimidazoles via Metal-Free Selective Oxidative Annulation of Arylamidines
摘要:
A fast and simple divergent synthesis of multisubstituted quinazolines and benzimidazoles was developed from readily available amidines, via iodine(III)-promoted oxidative C(sp(3))-C(sp(2)) and C(sp(2))-N bond formation in nonpolar and polar solvents, respectively. Further selective synthesis of quinazolines in polar solvent was realized by TEMPO-catalyzed sp(3)C-H/sp(2)C-H direct coupling of the amidine with K2S2O8 as the oxidant. No metal, base, or other additives were needed.
A novel and efficient methodology for the construction of quinazolines based on supported copper oxide nanoparticles
作者:Jintang Zhang、Chenmin Yu、Sujing Wang、Changfeng Wan、Zhiyong Wang
DOI:10.1039/c002454f
日期:——
A series of quinazolines were synthesized from 2-aminobenzophenones and benzylic amines in good to excellent yields by employing a new heterogeneous catalyst based on the copper oxide nanoparticles supported on kaolin.
A copper-catalyzed process for the synthesis of substituted quinazolinesfrom benzonitriles and 2-ethynylanilines using molecular oxygen (O2) as sole oxidant is described. The mild catalytic system enabled the effective cleavage of the C–C triple bond and construction of new C–N and C–C bonds in one operation. Furthermore, the compound N,N-dimethyl-4-(2-(4-(trifluoromethyl)phenyl)quinazolin-4-yl)aniline
Hydrogen peroxide-mediated synthesis of 2,4-substituted quinazolines <i>via</i> one-pot three-component reactions under metal-free conditions
作者:Khang H. Trinh、Khang X. Nguyen、Phuc H. Pham、Tung T. Nguyen、Anh N. Q. Phan、Nam T. S. Phan
DOI:10.1039/d0ra05040g
日期:——
An efficient metal-free synthesis of 2,4-substituted quinazolines via a hydrogen peroxide-mediated one-pot three-component reaction of 2-aminoaryl ketones, aldehydes, and ammonium acetate has been developed. The transformation proceeded readily under mild conditions in the presence of commercially available hydrogen peroxide. The significant advantages of this approach are (1) the readily available
One-pot sustainable synthesis of valuable nitrogen compounds from biomass resources
作者:M.Carolina A. Carreira、M. Conceição Oliveira、Ana C. Fernandes
DOI:10.1016/j.mcat.2021.112094
日期:2022.1
In this work we report a new one-pot process for the sustainable synthesis of 2-furanylquinazolines and 2-furfurylidene derivatives from carbohydrates, including xylose, fructose and xylan, with moderate overall yields, catalyzed by perrhenic acid.
TMSOTf-catalyzed synthesis of substituted quinazolines using hexamethyldisilazane as a nitrogen source under neat and microwave irradiation conditions
作者:Chieh-Kai Chan、Chien-Yu Lai、Cheng-Chung Wang
DOI:10.1039/d0ob01507e
日期:——
we report an efficient and mild synthetic route for the construction of substituted quinazolines from functionalized 2-aminobenzophenones with various benzaldehydes using cat. TMSOTf and hexamethyldisilazane (HMDS) under neat, metal-free and microwave irradiation conditions in which gaseous ammonia was formed in situ. This synthetic protocol provided the desired quinazolines with a broad substrate scope
在本文中,我们报道了一种高效且温和的合成路线,用于使用cat由官能化的 2-氨基二苯甲酮与各种苯甲醛构建取代的喹唑啉。TMSOTf 和六甲基二硅氮烷 (HMDS) 在纯净、无金属和微波辐照条件下原位形成气态氨。这种合成方案提供了所需的喹唑啉,其底物范围广泛,产率良好。通过 X 射线单晶衍射分析证实了一些结构。