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.
Microwave-promoted efficient synthesis of dihydroquinazolines
作者:Rupam Sarma、Dipak Prajapati
DOI:10.1039/c0gc00838a
日期:——
A solvent- and catalyst-free synthesis of dihydroquinazolines is described. 2,4-Disubstituted-1,2-dihydroquinazolines can be readily obtained from 2-aminobenzophenone and aldehydes under microwave irradiation using urea as an environmentally benign source of ammonia, with a small amount of the corresponding quinazolines as the minor product. The reaction is simple, clean and excellent yields are obtained within minutes.
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.