Catalyst‐free synthesis of quinazolinones by oxidative cyclization under visible light in the absence of additives
作者:Jiangnan Yang、Zongbo Xie、Zhongsheng Chen、Liang Jin、Qian Li、Zhanggao Le
DOI:10.1002/jhet.4275
日期:2021.7
general metal-free oxidative cyclization route was developed to synthesize quinazolinones under visible light. A series of substituted2-aminobenzamides were reacted with aldehydes or ketones to produce the desired quinazolinones in good yields. Most importantly, the reaction did not require excess oxidant or high temperatures.
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.
12-tungstophosphoric acid supported on silica gel (PW/SiO2) exhibits excellent activity in the synthesis of 2,3-dihydroquinazolin-4(1 H )-ones by cyclocondensation reaction of 2-aminobenzamide with carbonylcompounds in water under reflux conditions. The desired products have been obtained in short reaction times in high yields. Our method has been successfully applied for both aldehydes and ketones (aromatic and aliphatic)
硅胶上负载的12-钨磷酸(PW / SiO 2)在回流条件下通过2-氨基苯甲酰胺与羰基化合物在水中的环缩合反应,在合成2,3-二氢喹唑啉-4(1 H )-酮中显示出优异的活性。 。在短的反应时间内以高收率获得了所需的产物。我们的方法已成功应用于醛和酮(芳族和脂族)。与现有方法相比,该方法的主要优点是易于回收和可重复使用的催化剂,易于处理以及避免使用有害的有机溶剂。
Synthesis of 2,3-dihydroquinazolinones and quinazolin-4(3H)-ones catalyzed by graphene oxide nanosheets in an aqueous medium: “on-water” synthesis accompanied by carbocatalysis and selective C–C bond cleavage
作者:Nazia Kausar、Indranil Roy、Dipankar Chattopadhyay、Asish R. Das
DOI:10.1039/c6ra00388e
日期:——
Graphene oxide (GO) nanosheet catalyzed new and straightforward strategies for the construction of 2,3-dihydroquinazolinones and quinazolin-4(3H)-ones starting from anthranilamide (2-aminobenzamide) and an aldehyde/ketone in aqueous medium at room temperature have been realized. This catalyst is also found to be efficient for the expedient construction of quinazolin-4(3H)-ones starting from anthranilamide
Facile Method for the Combinatorial Synthesis of 2,2-Disubstituted Quinazolin-4(1<i>H</i>)-one Derivatives Catalyzed by Iodine in Ionic Liquids
作者:Xiang-Shan Wang、Ke Yang、Jie Zhou、Shu-Jiang Tu
DOI:10.1021/cc900174p
日期:2010.7.12
A mild and facile method for the combinatorial synthesis of quinazolin-4-(1H)-one derivatives, containing simple 2,2-disubstituted quinazolin-4-(1H)-ones, spirocyclic quinazolin-4-(1H)-ones, spiro-heterocyclic quinazolin-4-(1H)-ones, and dispirocyclic quinazolin-4-(1H)-ones, is described, which results in high yields by using ionicliquids as green media. The method involves the reaction of 2-aminobenzamides