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.
Synthesis of imidazo[1,2-<i>c</i>]quinazolin-5(6<i>H</i>)-ones and benzimidazo[1,2-<i>c</i>]quinazolin-6(5<i>H</i>)-ones with the aid of low-valent titanium reagent
作者:Xuan Zhao、Da-Qing Shi
DOI:10.1002/jhet.353
日期:——
A short and facile synthesis of imidazo[1,2-c]quinazolin-5(6H)-ones and benzimidazo[1,2-c]quinazolin-6(5H)-ones was accomplished in good yields via the novel reductive cyclization of 2-(2-nitrophenyl)imidazoles or 2-(2-nitrophenyl)benzoimidazoles with isocyanates promoted by low-valenttitaniumreagent. J. Heterocyclic Chem., (2010).
通过新颖的还原反应,以良好的收率完成了咪唑并[1,2 - c ]喹唑啉-5(6 H)-one和苯并咪唑并[1,2 - c ]喹唑啉-6(5 H)-one的短而容易的合成。低价钛试剂促进异氰酸酯对2-(2-硝基苯基)咪唑或2-(2-硝基苯基)苯并咪唑的环化反应。J.杂环化学。(2010)。