I2-Catalyzed three-component protocol for the synthesis of quinazolines
作者:Sumit Kumar Panja、Nidhi Dwivedi、Satyen Saha
DOI:10.1016/j.tetlet.2012.08.016
日期:2012.11
moderate temperature (40 °C) without the involvement of any chromatographic purification. Oxidizing and Lewis acidic properties of molecular I2 have been utilized here. Detailed mechanism has been established based on an isolated intermediate and its single crystal X-ray crystallographic structure.
activators. 3 Very re- cently Wang et al., reported an elegant synthesis of 2-phe- nylquinazolines employing molecular iodine/TBHP and also with supported copper oxide nanoparticles. 4 Truong et al. described copper-catalyzed Ullmann N-arylation coupling process to synthesize 2-phenylquinazolines from the corresponding o-iodobenzaldehydes and benzamidine hydrochloride under ligand-free conditions. 5 However
Recyclable, magnetic ionic liquid bmim[FeCl4]-catalyzed, multicomponent, solvent-free, green synthesis of quinazolines
作者:Sumit Kumar Panja、Satyen Saha
DOI:10.1039/c3ra42039f
日期:——
An atom-efficient, eco-friendly, solvent-free, high yielding, multicomponent green strategy to synthesize highly functionalized quinazoline derivatives by the one-pot reaction of 2-aminobenzophenone, aromatic aldehyde and ammonium acetate is presented. Magnetic IL, butylmethylimidazolium tetrachloroferrate (bmim[FeCl4]) has been used successfully as a catalyst in a multicomponent synthetic strategy for the first time. The catalytic cycle and a tentative reaction mechanism were discussed and experimentally verified. Structural and optical properties of the synthesized quinazolines are also described.
Pentafluorophenylammonium triflate as a suitable and effective metal-free catalyst for the synthesis of quinazoline derivatives via one-pot multicomponent method
作者:Samad Khaksar、Milad Gholami
DOI:10.1007/s11164-013-1483-7
日期:2015.6
A simple and facile synthesis of highly functionalized quinazoline derivatives has been successfully developed by treatment of aldehydes, ammonium acetate, and 2-aminoaryl ketones or isatoic anhydride under reflux conditions in the presence of a pentafluorophenylammonium triflate (PFPAT) organocatalyst. These catalytic condensation reactions represent green chemical processes, while the PFPAT organocatalyst is air-stable, cost-effective, easy to handle, and easily removed from the reaction mixtures.