An efficient synthesis of quinazoline-2,4-dione derivatives with the aid of a low-valent titanium reagent
作者:Da-Qing Shi、Guo-Lan Dou、Zheng-Yi Li、Sai-Nan Ni、Xiao-Yue Li、Xiang-Shan Wang、Hui Wu、Shun-Jun Ji
DOI:10.1016/j.tet.2007.07.011
日期:2007.9
A facile synthetic method using low-valenttitaniumreagent (TiCl4/Zn system) to promote the novel reductive cyclization of 2-nitrobenzamides and triphosgene is described. Sequentially, a series of quinazoline-2,4-diones were synthesized in good yields.
Stannous Chloride in Alcohol: A One-Pot Conversion of 2-Nitro-<i>N</i>-arylbenzamides to 2,3-Dihydro-1<i>H</i>-quinazoline-4-ones
作者:Choong Leol Yoo、James C. Fettinger、Mark J. Kurth
DOI:10.1021/jo050450f
日期:2005.8.1
A novel one-step synthesis of 2,3-dihydro-1H-quinazolin-4-ones from 2-nitrobenzamides is reported. These reactions are mediated by stannous chloride in 0.02 M methanolic or ethanolic HCl solution and proceed in good yields.