Metal-free oxidative cyclization of 2-amino-benzamides, 2-aminobenzenesulfonamide or 2-(aminomethyl)anilines with primary alcohols for the synthesis of quinazolinones and their analogues
A general metal-free oxidative cyclization process has been developed for the synthesis of quinazolinones, benzothiadiazines and quinazolines. By this protocol, a range of substituted 2-aminobenzamides, 2-aminobenzenesulfonamide and 2-(aminomethyl)anilines react with various alcohols, leading to the desired annulated products smoothly. This protocol features many advantages as broad substrate scope
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
Chemoselective Trifluoroethylation Reactions of Quinazolinones and Identification of Photostability
作者:Saikat Maiti、Jaeshin Kim、Jae-Heon Park、Dongsik Nam、Jae Bin Lee、Ye-Jin Kim、Jung-Min Kee、Jeong Kon Seo、Kyungjae Myung、Jan-Uwe Rohde、Wonyoung Choe、Oh-Hoon Kwon、Sung You Hong
DOI:10.1021/acs.joc.9b00470
日期:2019.6.7
trifluoroethylation routes of unmasked 2-arylquinazolin-4(3H)-ones using mesityl(2,2,2-trifluoroethyl)iodonium triflate at room temperature. Homologous C-, O-, and N-functionalized subclasses are accessed in a straightforward manner with a wide substrate scope. These chemoselective branching events are driven by Pd-catalyzed ortho-selective C–H activation at the pendant arylring and base-promoted reactivity
Site‐Selective C–H Amidation of 2‐Aryl Quinazolinones Using Nitrene Surrogates
作者:Saegun Kim、Daeun Jeoung、Kunyoung Kim、Seok Beom Lee、Suk Hun Lee、Min Seo Park、Prithwish Ghosh、Neeraj Kumar Mishra、Suckchang Hong、In Su Kim
DOI:10.1002/ejoc.202001128
日期:2020.12.13
The site‐selectiveC–Hamidation of 2‐aryl quinazolin‐4(3H)‐ones with dioxazolones under rhodium(III) catalysis is described. Gram‐scale reaction, late‐stage C–H functionalization, and synthetic transformations highlight the potential of the developed method.