TMSOTf-catalyzed synthesis of substituted quinazolines using hexamethyldisilazane as a nitrogen source under neat and microwave irradiation conditions
作者:Chieh-Kai Chan、Chien-Yu Lai、Cheng-Chung Wang
DOI:10.1039/d0ob01507e
日期:——
we report an efficient and mild synthetic route for the construction of substituted quinazolines from functionalized 2-aminobenzophenones with various benzaldehydes using cat. TMSOTf and hexamethyldisilazane (HMDS) under neat, metal-free and microwave irradiation conditions in which gaseous ammonia was formed in situ. This synthetic protocol provided the desired quinazolines with a broad substrate scope
在本文中,我们报道了一种高效且温和的合成路线,用于使用cat由官能化的 2-氨基二苯甲酮与各种苯甲醛构建取代的喹唑啉。TMSOTf 和六甲基二硅氮烷 (HMDS) 在纯净、无金属和微波辐照条件下原位形成气态氨。这种合成方案提供了所需的喹唑啉,其底物范围广泛,产率良好。通过 X 射线单晶衍射分析证实了一些结构。
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.
A TEMPO promoted tandem reaction of 2-aminobenzophenones and benzylamines under electrochemical conditions
作者:Yu Wang、Yekai Huang、Yanan Li、Kuiliang Li、Zaigang Luo
DOI:10.1039/d4ob00037d
日期:——
This study describes the efficient synthesis of quinazolines promoted by TEMPO via electro-catalysis with 2-aminobenzophenones and benzylamines. The method exhibited remarkable chemoselectivity under mild reaction conditions. A series of quinazolines could be obtained in moderate to good yields. In addition, control experiments were carried out to verify the reaction mechanism. Furthermore, the synthesis