An efficient synthesis of quinazoline derivatives with the aid of low-valent titanium reagent
作者:Daqing Shi、Chunling Shi、Juxian Wang、Liangce Rong、Qiya Zhuang、Xiangshan Wang
DOI:10.1002/jhet.5570420201
日期:2005.3
Quinazolin-4(3H)-ones, 1,2-dihydroquinazolin-4(3H)-ones, 3,4-dihydroquinazolines, imidazo[1,2-c]-quinazolines and 5,6-dihydroimidazo[1,2-c]quinazolines were synthesized by the novel reductive reaction of nitro group, N-H bond and ortho-ester, aldehydes or ketones promoted by the low-valenttitaniumreagent (TiCl4-Zn system). The structures of these compounds were characterized by elemental analysis
喹唑啉-4(3 H)-one,1,2-二氢喹唑啉-4(3 H)-one,3,4-二氢喹唑啉,咪唑并[1,2- c ]-喹唑啉和5,6-二氢咪唑并[1,2 - c ^ ]喹唑啉通过将低价钛试剂(促进的TiCl硝基,NH键和原酸酯,醛或酮的新型还原反应,合成4 -Zn系统)。这些化合物的结构通过元素分析,IR和1 HNMR光谱进行表征,并通过单晶X射线衍射分析进一步证实。
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.
Catalytic Hydroboration and Reductive Amination of Carbonyl Compounds by HBpin using a Zinc Promoter
作者:Ravi Kumar、Parveen Rawal、Indrani Banerjee、Hari Pada Nayek、Puneet Gupta、Tarun K. Panda
DOI:10.1002/asia.202200013
日期:2022.3
Chemoselective hydroboration of aldehydes and ketones with HBpin catalyzed by iminopyridine supported zinc(II) complex under ambient conditions is reported.
报道了在环境条件下由亚氨基吡啶负载的锌 (II) 络合物催化的醛和酮与 HBpin 的化学选择性硼氢化反应。
An efficient synthesis of 2H-indazoles via reductive cyclization of 2-nitrobenzylamines induced by low-valent titanium reagent
作者:Fang Sun、Xian Feng、Xuan Zhao、Zhi-Bin Huang、Da-Qing Shi
DOI:10.1016/j.tet.2012.03.043
日期:2012.5
An efficient and improved synthesis of 2H-indazoles via reductive cyclization of 2-nitrobenzylamines induced by low-valenttitaniumreagent (TiCl4/Zn) is described. In this reaction triethylamine (TEA) was used to control the pH value. This method has the advantages of easily accessible starting materials, convenient manipulation, higher yield, shorter reaction time, and wider substrate scope.
Synthesis of 3-Aryl-3,4-Dihydroquinazolin-2(1H)-Ones with the Aid of Low-Valent Titanium Reagent (TiCl<sub>4</sub>-Sm)
作者:Daqing Shi、Guolan Dou、Zheng-Yi Li
DOI:10.3184/030823407x248306
日期:2007.9
A short and facile synthesis of a series of 3-aryl-3,4-dihydroquinazolin-2(1H)-ones was accomplished in good yields via the novel reductive cyclisation of 2-nitrobenzylamines with bis(trichloromethyl)carbonate (triphosgene) promoted by TiCl4/Sm system. The structures of the products were characterised by IR, 1H NMR and elemental analysis and the structure of 3a was confirmed by X-ray diffraction analysis