A highly efficient heterogeneous copper-catalyzed cascade reaction of 2-halobenzoic acids and amidines leading to quinazolinones
作者:Wen He、Hong Zhao、Ruiya Yao、Mingzhong Cai
DOI:10.1039/c4ra09379h
日期:——
The heterogeneous cascade reaction of 2-halobenzoic acids and amidines was achieved in DMF at 60 °C in the presence of 10 mol% of MCM-41-immobilized tridentate nitrogen copper(I) complex [MCM-41-3N–CuI] using Cs2CO3 as base, yielding a variety of quinazolinone derivatives in good to excellent yields. This heterogeneous copper catalyst can be easily prepared from commercially available and inexpensive
2-卤代苯甲酸和am的级联反应是在60°C的DMF中,使用Cs在10 mol%的MCM-41固定的三齿氮铜(I)络合物[MCM-41-3N–CuI]存在下完成的以2 CO 3为碱,以良好或优异的产率生成各种喹唑啉酮衍生物。这种多相铜催化剂可以容易地由市售和廉价的试剂制备,并通过对反应溶液的简单过滤来回收,并且在不降低活性的情况下重复使用至少10次。
Metal- and Oxidant-Free Synthesis of Quinazolinones from <i>β</i>-Ketoesters with <i>o</i>-Aminobenzamides via Phosphorous Acid-Catalyzed Cyclocondensation and Selective C–C Bond Cleavage
and efficient phosphorous acid-catalyzed cyclocondensation of β-ketoesters with o-aminobenzamides via selective C–C bond cleavage leading to quinazolinones is developed. This reaction proceeds smoothly under metal- and oxidant-free conditions, giving both 2-alkyl- and 2-aryl-substituted quinazolinones in excellent yields. This strategy can also be applied to the synthesis of other N-heterocycles, such