已经实现了一种通过分子内无受体脱氢偶联合成多种二氢异喹啉[ 2,1- a ]喹唑啉酮、2-芳基喹唑啉酮和类似物的简单、高效和清洁的方法。双(2-甲氧基乙基)醚和分子氧的组合被确定为这种氧化脱氢偶联顺序转化的高效体系,无需外部引发剂、催化剂和添加剂。通过29个例子的范围和克级反应证明了其适用性和实用性。还进行了一些对照实验以支持可能的反应途径。
Synthesis of 2,3-Disubstituted Quinazolinone Derivatives through Copper Catalyzed C-H Amidation Reactions
作者:Trimurtulu Kotipalli、Veerababurao Kavala、Donala Janreddy、Vijayalakshmi Bandi、Chun-Wei Kuo、Ching-Fa Yao
DOI:10.1002/ejoc.201501552
日期:2016.2
The synthesis of quinazolinone derivatives was achieved from 2-iodobenzamide derivatives and various benzylamines, allylamine, and cinnamylamine derivatives through a one-pot copper-catalyzed reaction. In this reaction, the amine component (benzylamine/allylamine/cinnamylamine) is N-arylated with 2-iodobenzamide derivatives through Ullman coupling, followed by an intramolecular C–H amidation in the
We demonstrate the direct use of benzylic alcohols for a multicomponent reaction of readily available isatoic anhydrides with amines in water, which is a synthetic route for the direct construction of a series of 2-aryl quinazolinones. This one-pot synthetic method involves the dehydrative N-benzylation of in situ generated anthranilamides followed by an amide-directed benzylic C−H amination process
AbstractA novel approach for the synthesis of 2‐arylquinazolin‐4(3H)‐ones was developed. A series of title compounds were obtained with good functional group tolerance and good yields by I2/DMSO‐mediated intramolecular oxidative cross‐coupling of 2‐(benzylamino)benzamides to form C=N double bonds. This method was applicable for gram‐scale synthesis. A proposed reaction pathway based on some control experiments was also provided.
BAIOCCHI L.; PICCONI G., TETRAHEDRON LETT., 27,(1986) N 43, 5255-5256