Metal‐Free, Visible‐Light Promoted Intramolecular Azole C−H Bond Amination Using Catalytic Amount of I
<sub>2</sub>
: A Route to 1,2,3‐Triazolo[1,5‐
<i>a</i>
]quinazolin‐5(4
<i>H</i>
)‐ones
作者:Weigen Du、Hongtai Huang、Tiebo Xiao、Yubo Jiang
DOI:10.1002/adsc.202000917
日期:2020.11.18
A metal‐free, visible‐light promoted intramolecular azole C−H bond amination for the rapid and efficient synthesis of pharmaceutical important 1,2,3‐triazolo[1,5‐a]quinazolin‐5(4H)‐ones has been developed. Employing 2‐(1,2,3‐triazol‐1‐yl)benzamides as the easily available precursors and catalytic amount of I2 as an initiator, the desired product were isolated in moderate to excellent yiels with a broad
快速有效合成重要的1,2,3-三唑[1,5 - a ]喹唑啉-5(4 H)-酮的无金属,可见光促进的分子内唑氢键形成胺化反应发达。使用2-(1,2,3-三唑-1-基)苯甲酰胺作为易得的前体,并以催化量的I 2作为引发剂,以中等至优异的收率分离出所需的产物,具有广泛的底物范围和良好的功能小组宽容。此外,该协议具有条件温和,操作简单且易于扩展的特点。初步的机理研究表明,反应过程中可能涉及自由基途径。