S<sub>N</sub>Ar versus Buchwald-Hartwig Amination/Amidation in the Imidazo[2,1-<i>b</i>][1,3,4]thiadiazole Series
作者:Chloé Copin、Stéphane Massip、Jean-Michel Léger、Christian Jarry、Frédéric Buron、Sylvain Routier
DOI:10.1002/ejoc.201500977
日期:2015.11
An original and efficient palladium-catalyzed amination of imidazo[2,1-b][1,3,4]thiadiazole is reported. The SNAr and Buchwald–Hartwig cross-coupling reactions were investigated to access C-2 aminated imidazo[1,2-b][1,3,4]thiadiazole derivatives. The reaction conditions were optimized under microwave irradiation, and a wide range of amines were used to determine the scope and limitations of the method
报道了一种新颖且有效的钯催化胺化咪唑并 [2,1-b][1,3,4] 噻二唑。研究了 SNAr 和 Buchwald-Hartwig 交叉偶联反应以获取 C-2 胺化咪唑并 [1,2-b][1,3,4] 噻二唑衍生物。在微波辐射下对反应条件进行了优化,并使用了多种胺来确定该方法的适用范围和局限性。为了完成这项研究,比较了钯催化和 SNAr 胺化反应以确定最佳策略。咪唑并[2,1-b][1,3,4]噻二唑衍生物20的X射线晶体学数据用于正式确定产物的结构。