Palladium(0)-Catalyzed, Copper(I)-Mediated Coupling of Boronic Acids with Cyclic Thioamides. Selective Carbon−Carbon Bond Formation for the Functionalization of Heterocycles<sup>†</sup>
作者:Hana Prokopcová、C. Oliver Kappe
DOI:10.1021/jo070408f
日期:2007.6.1
Employing controlled microwave irradiation at 100 °C, most cross-couplings can be completed within 2 h and proceed in high yields. An advantage of using thioamides as starting materials is the fact that the system can be tuned to an alternative carbon−sulfur cross-coupling pathway by changing to stoichiometric copper(II) under oxidative conditions. Both types of thioamide cross-couplings are orthogonal to
描述了在化学计量的铜(I)辅因子存在下,钯催化的环硫酰胺与芳基硼酸的交叉偶联。脱硫碳-碳交叉偶联方案是在中性条件下进行的,可应用于具有嵌入的硫酰胺片段的杂环结构。成功的碳-碳交叉偶联与环大小,芳香性/非芳香性,起始硫酰胺结构中是否存在其他杂原子或其他官能团无关。通过在100°C下控制微波辐射,大多数交叉偶联可在2 h内完成,并以高收率进行。使用硫代酰胺作为起始原料的一个优点是,可以通过在氧化条件下更改为化学计量的铜(II),将系统调节至另一种碳-硫交叉偶联途径。两种类型的硫酰胺交叉偶联均与芳烃卤化物与硼酸的传统碱催化的Suzuki-Miyaura交叉偶联正交。