Efficient Synthesis of Quinazolinones by Transition‐Metal‐Free Direct Aerobic Oxidative Cascade Annulation of Alcohols with<i>o</i>‐Aminoarylnitriles
作者:Qi Wang、Miao Lv、Jianping Liu、Yang Li、Qing Xu、Xu Zhang、Hongen Cao
DOI:10.1002/cssc.201900265
日期:2019.7.5
A mild and atom‐economic method was developed for direct and efficient synthesis of quinazolinones through a transition‐metal‐free aerobic oxidative cascade annulation reaction of widely available o‐aminoarylnitriles and alcohols. Air could be employed as an effective oxidant under mild conditions, generating water as the only byproduct. Possibly owing to the “cesium effect”, the water‐soluble base
A cascadesynthesis of quinazolinones from 2-aminobenzonitriles and aryl bromides through a palladium-catalyzedcarbonylation reaction has been developed. Various quinazolinones were produced in moderate to excellent yields. The reactions go through aminocarbonylation of aryl bromides–hydration of nitriles–cyclization sequence. Notably, all the products were isolated by recrystallization.
A copper catalyzed multicomponent cascade redox reaction for the synthesis of quinazolinones
作者:Mahesh H. Shinde、Umesh A. Kshirsagar
DOI:10.1039/c6ra10997g
日期:——
A copper catalyzedmulticomponentcascade redox reaction for the synthesis of various quinazolinones starting from easily available 2-bromobenzamides, benzylic alcohols and sodium azide as a nitrogen source has been developed. The reaction involves copper catalyzed azidation of 2-bromobenzamide via an SNAr reaction and oxidation of benzyl alcohol followed by sequential reduction–condensation–oxidation
已经开发了一种铜催化的多组分级联氧化还原反应,用于从容易获得的2-溴苯甲酰胺,苯甲醇和叠氮化钠作为氮源开始合成各种喹唑啉酮。该反应涉及通过S N Ar反应进行铜催化的2-溴苯甲酰胺叠氮化和苯甲醇的氧化,然后依次进行还原-缩合-氧化以生成喹唑啉酮。
Ruthenium-Catalyzed Regioselective Alkenylation/Tandem Hydroamidative Cyclization of Unmasked Quinazolinones Using Terminal Alkynes
作者:Amol B. Viveki、Santosh B. Mhaske
DOI:10.1021/acs.joc.8b01143
日期:2018.8.17
Ruthenium-catalyzed amide directed C-sp2-H activation of the quinazolinone scaffold has been demonstrated, leading to the selective mono- or dialkenylation in moderate to good yields to achieve medicinally important stilbene containing quinazolinones. The terminal allcyne is utilized as a coupling partner, which resulted in the selective trans-alkene formation. Electron-deficient phenylacetylenes facilitate alkenylation followed by tandem hydroamidation of the newly generated trans double bond to provide novel quinazolinone alkaloids related to the Luotonine class of natural products.