Palladium‐Catalyzed Carbonylative Difunctionalization of C=N Bond of Azaarenes or Imines to Quinazolinones
作者:Xibing Zhou、Yongzheng Ding、Hanmin Huang
DOI:10.1002/asia.202000359
日期:2020.6.2
Supporting information for this article is given via a link at the end of the document. By intercepting the acylpalladium species with C=Nbond of azaarenes or imines other than free amines or alcohols, the difunctionalization of C=Nbond was established via palladium‐catalyzed carbonylation/nucleophilic addition sequence. This method is compatible with a diverse range of azaarenes and imines and allows
Copper-Mediated Tandem C(<i>sp</i>
<sup>2</sup>
)-H Amination and Annulation of Arenes with 2-Aminopyridines: Synthesis of Pyrido-fused Quinazolinone Derivatives
作者:Jidan Liu、Jinhui Zou、Jiawei Yao、Guoshu Chen
DOI:10.1002/adsc.201701286
日期:2018.2.15
An efficient and convenient copper‐mediated tandem C(sp2)‐H amination and annulation of arenes with 2‐aminopyridines to provide 11H‐pyrido[2,1‐b]quinazolin‐11‐ones has been developed. A variety of benzamides and 2‐aminopyridines bearing different substituents are compatible with this transformation
开发了一种高效便捷的铜介导的串联C(sp 2)-H胺化和芳烃与2-氨基吡啶的环化反应,以提供11个H-吡啶并[ 2,1- b ]喹唑啉-11-酮的方法。各种带有不同取代基的苯甲酰胺和2-氨基吡啶与这种转化相容
Copper‐Catalyzed Aerobic Oxidation of N‐Pyridylindole Leading to Fused Quinazolinones
作者:Yaqing Ye、Yuanyuan Yue、Xiaohui Guo、Junli Chao、Yan Yang、Chunying Sun、Qingzhang Lv、Jianming Liu
DOI:10.1002/ejoc.202100618
日期:2021.7.15
and aerobicoxidation of N-pyridylindole. This approach can be performed by copper(II)/air system to deliver the desired quizolinone. A series of substituted N-pyridylindoles were appropriate substrate to furnish this transformation. Mechanistically, the single-electron-transfer oxidation, the capture of molecular oxygen and the extrusion of carbon monoxide were involved in the aerobicoxidation of
autoclave‐free protocol for the synthesis of 11H‐pyrido[2,1‐b]quinazolin‐11‐ones has been developed. Quinazolinones, which are omnipresent motif in many pharmaceuticals and agrochemicals, were prepared in good yields by CH bond activation and annulation using DMF as the CO surrogate. A 13CO‐labelled DMF control experiment demonstrated that CO gas was released from the carbonyl of DMF with acid as
为11的合成一种新型的钯催化CO-气体和无高压釜协议ħ -吡啶并[2,1- b ]喹唑啉-11-那些已经研制成功。喹唑啉酮是许多药物和农用化学品中无处不在的基序,它是通过CH键活化和使用DMF作为CO替代物进行环化而制备的,产率很高。一项13 CO标记的DMF对照实验表明,以酸为促进剂从DMF的羰基中释放出CO气体。的动力学同位素效应(KIE)值指示,在C ħ活化步骤可以不是在速率决定步骤有关。该方法操作简单,显示了广泛的底物范围,具有良好至极好的产率。
Base-Controlled Selectivity in the Synthesis of Linear and Angular Fused Quinazolinones by a Palladium-Catalyzed Carbonylation/Nucleophilic Aromatic Substitution Sequence
A new approach for the facile synthesis of fused quinazolinone scaffolds through a palladium‐catalyzed carbonylative coupling followed by an intramolecular nucleophilic aromatic substitution is described. The base serves as the key modulator: Whereas DBU gives rise to the linear isomers, Et3N promotes the preferential formation of angular products. Interestingly, a light‐induced 4+4 reaction of the