a tin-free radical cascade cyclizationprocess. Not only do amide-iminyl radicals lead to new tetracyclic heterocycles but these nitrogen-centered radical species also react in aromatic homolytic substitutions. Indeed, the amide-iminyl radical moiety unprecedentedly displaces methyl, methoxy, and fluorine radicalsfrom an aromatic carbon atom. This seminal reaction in the field of radical chemistry
A visible-light-induced/thiourea-mediated intramolecularcyclization of o-nitroarenes under mild conditions is realized for the first time, which provides an efficient and environmentally friendly way to access pharmaceutical relevant quinazolinone derivatives. The reaction can be easily extended to gram level by using a continuous-flow setup with high efficiency. Mechanistic investigation including
Synthesis of Tetracyclic Quinazolinones Using a Visible-Light-Promoted Radical Cascade Approach
作者:Yue-Yue Han、Heng Jiang、Ruzhi Wang、Shouyun Yu
DOI:10.1021/acs.joc.6b00869
日期:2016.8.19
A practical approach for the synthesis of tetracyclic pyrroloquinazolines using photoredox strategy has been developed. The visible-light-promoted intramolecular single-electron-transfer (SET) process between photocatalyst and N-(2-iodobenzyl)-N-acylcyanamides is considered to be involved in this transformation. Targeted pyrroloquinazoline derivatives (15 examples) are presented in good isolated yields
Palladium-catalyzed dicarbonylative synthesis of tetracycle quinazolinones
作者:Chaoren Shen、Nikki Y. T. Man、Scott Stewart、Xiao-Feng Wu
DOI:10.1039/c5ob00368g
日期:——
An interesting procedure for the synthesis of isoindolo[1,2-b]quinazolin-10(12H)-ones has been developed. Starting from commercially available 2-bromoanilines and 2-bromobenzyl amines, with the assistance of a palladium catalyst, the desired products were isolated in good yields. Notably, this procedure proceeded in a highly selective manner; two molecules of CO were incorporated into the substrates
已经开发了一种有趣的合成异吲哚并[1,2 - b ]喹唑啉-10(12 H)-ones的方法。从商业上可获得的2-溴苯胺和2-溴苄基胺开始,在钯催化剂的辅助下,以高收率分离出所需产物。值得注意的是,该程序以高度选择性的方式进行。将两个分子的CO选择性地掺入底物中。
Nickel-Catalyzed Intramolecular Dual Annulation Reaction of Aryl Nitrile-Containing 1,2,3-Benzotriazin-4(3<i>H</i>)-ones: A Pathway To Synthesize Luotonin A and Related Polycyclic Pyrroloquinazolinones
作者:Vijaykumar H. Thorat、Jen-Chieh Hsieh
DOI:10.1021/acs.orglett.3c03142
日期:2023.11.10
Herein, we report a nickel-catalyzed intramolecular denitrogenative dual annulation reaction of aryl nitrile-containing 1,2,3-benzotriazine-4(3H)-ones to synthesize polycyclic pyrroloquinazolinones with a tolerance of a wide diversity of substituents. This catalytic reaction is the first denitrogenative transannulation of 1,2,3-benzotriazine-4(3H)-one with nitrile, which can be applied as the critical
在此,我们报道了含芳基腈的1,2,3-苯并三嗪-4(3 H )-酮的镍催化分子内脱氮双环化反应,合成了具有多种取代基的多环吡咯并喹唑啉酮。该催化反应是1,2,3-苯并三嗪-4(3H)-酮与腈的首次脱氮转环反应,可作为合成洛托宁A的关键步骤,具有较高的步骤经济性。