A Cu-catalyzed tandem synthesis of azole-fused pyrimido[1,2-c]quinazolines and imidazo[1,2-c]quinazolines has been developed. The reaction is based on a C–N cross-coupling/C–H functionalizationreaction of 2-(2-bromophenyl)-1,4,5,6-tetrahydropyrimidines with azoles. A variety of the desired polycyclic products were obtained in moderate to excellent yields.
已开发出Cu催化串联合成吡咯并嘧啶并[1,2- c ]喹唑啉和咪唑并[1,2- c ]喹唑啉的方法。该反应基于2-(2-溴苯基)-1,4,5,6-四氢嘧啶与唑类的CN交叉偶联/ CH功能化反应。以中等至优异的产率获得了各种所需的多环产物。
Transition metal-free construction of trinuclear N-fused hybrid scaffolds by double nucleophilic aromatic substitution under microwave irradiation
作者:Pham Duy Quang Dao、Ho-Jin Lim、Chan Sik Cho
DOI:10.1039/c9gc03410b
日期:——
under microwave irradiation triggers double C(sp2)–N coupling to form trinuclear N-fused hybrid scaffolds. A reaction pathway involving nucleophilic aromaticsubstitution (SNAr) accompanied by ammonia evolution is proposed as a key step of this transition metal-free process.
An efficient one-pot sequential procedure is described for the synthesis of novel azole-fused quinazolines through Ullmann-type coupling followed by cross dehydrogenative coupling of various azoles with 2-(2-bromophenyl)-1H-imidazole/benzimidazoles.