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
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
Synthesis of Pyrido[2,1-<i>b</i>]quinazolin-11-ones and Dipyrido[1,2-a:2′,3′-<i>d</i>]pyrimidin-5-ones by Pd/DIBPP-Catalyzed Dearomatizing Carbonylation
作者:Tongyu Xu、Howard Alper
DOI:10.1021/acs.orglett.5b00452
日期:2015.3.20
1-b]quinazolin-11-ones were obtained from N-(2-bromophenyl)pyridine-2-amines in up to quantitative yield and dipyrido[1,2-a:2′,3′-d]pyrimidin-5-ones from 3-bromo-N-(pyridine-2-yl)pyridine-2-amines in up to 84% yield. The cyclocarbonylation can be also realized without isolation of compound 1 and additional palladium catalyst.
通过使用1,3-双(二异丁基膦基)丙烷(DIBPP)作为配体的钯催化的脱芳构羰基化反应,可以轻松合成N杂环。从N-(2-溴苯基)吡啶-2-胺中定量获得吡啶并[2,1- b ]喹唑啉-11-酮和二吡啶并[1,2-a:2',3'- d ]来自3-溴-N-(吡啶-2-基)吡啶-2-胺的嘧啶-5-酮,产率高达84%。也可以在不分离化合物1和另外的钯催化剂的情况下实现环羰基化。
Tf2O-mediated [4+2]-annulation of anthranils with 2-chloropyridines: enabling access to pyridoquinazolinones and euxylophoricine B
2-chloropyridines, resulting in therapeutically useful pyridoquinazolinones. The reaction is tolerant to various functional groups, allowing access to a wide range of substituted pyridoquinazolinones in good yields. Furthermore, the synthesis of euxylophoricine B, known to be an antitumor agent, was also achieved.
我们提出了一种在三氟甲磺酸酐存在下,利用邻氨基苯甲醚和 2-氯吡啶作为起始原料合成吡啶并喹唑啉酮的有效方法。在此过程中,Tf 2 O首先激活邻氨基苯甲醚,形成亲电的1-((三氟甲基)磺酰基)苯并[ c ]异恶唑-1-鎓物种。该物质与 2-氯吡啶发生原位环化反应,产生治疗上有用的吡啶并喹唑啉酮。该反应对各种官能团具有耐受性,能够以良好的产率获得各种取代的吡啶并喹唑啉酮。此外,还合成了已知的抗肿瘤药物Euxylophoricine B。