Regioselective synthesis of fluoroalkylated [1,2,3]-triazoles by Huisgen cycloaddition
作者:Yong-Ming Wu、Juan Deng、Xiang Fang、Qing-Yun Chen
DOI:10.1016/j.jfluchem.2004.02.016
日期:2004.10
A series of fluoroalkylated 1,4-disubstituted [1,2,3]-triazoles were synthesized by the 1,3-dipolar cycloaddition of fluoroalkylated azides with terminal alkynes in the presence of Cu(I) salt as catalyst at room temperature. All the reactions were performed in highly regioselective with 1,4-disubstituted, no 1,5-disubstituted product was formed. For aryl or alkyl-alkyne, triethylamine should be used
在室温下,在作为催化剂的Cu(I)盐存在下,通过末端烷基炔烃与氟代烷基叠氮化物的1,3-偶极环加成反应,合成了一系列氟代烷基化1,4-二取代[1,2,3]-三唑。所有反应均在具有1,4-二取代的高度区域选择性的条件下进行,未形成1,5-二取代的产物。对于芳基或烷基炔,应使用三乙胺作为配体。但是对于丙酸酯(酰胺),则不能使用三乙胺,否则不会生成任何产物。提出了Cu(I)插入内部炔烃的机制。