Facile and One-Pot Synthesis of 1,2-Dihydroquinazolin-4(3<i>H</i>)-ones via Tandem Intramolecular Pinner/Dimroth Rearrangement
作者:Jian-Hong Tang、Da-Xin Shi、Li-Jun Zhang、Qi Zhang、Jia-Rong Li
DOI:10.1080/00397910902908822
日期:2010.2.12
method for the preparation of quinazolin-4-one derivatives was designed. The facile condensation of aromatic o-aminonitriles with aromatic aldehydes catalyzed by Lewis acid give 1,2-dihydroquinazolin-4(3H)-ones in moderate to good yields under refluxing dimethylformamide.
A modified Friedländer conversion of the cyclocondensation of aromatic o‐aminonitriles with carbonyl compounds was discovered. Systematic studies reveal that both the new transformation and the classic Friedländer annulation in the presence of ZnCl2 constitute a pair of divergent reaction, and thecontrolled PDF transformation of this divergent reaction was achieved in the present of bases.
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。
Synthesis of quinazolin-4(3 H )-ones and 1,2-dihydroquinazolin-4(3 H )-ones with the aid of a low-valent titanium reagent
作者:Daqing Shi、Liangce Rong、Juxian Wang、Qiya Zhuang、Xiangshan Wang、Hongwen Hu
DOI:10.1016/s0040-4039(03)00449-0
日期:2003.4
A short and facile synthesis of a series of quinazolin-4(3H)-ones and 1,2-dihydroquinazolin-4(3H)-ones was accomplished in good yields via the novel reductive cyclization of o-nitrobenzamides and triethyl orthoformate, aldehydes or ketones promoted by TiCl4/Zn.