Magnetically recyclable palladium nanoparticles (Fe
<sub>3</sub>
O
<sub>4</sub>
‐Pd) for oxidative coupling between amides and olefins at room temperature
for the synthesis of magnetically recyclable palladium nanoparticles (Fe3O4‐Pd) is described. The catalytic application of the Fe3O4‐Pd nanoparticles was explored for the first time in oxidative coupling between amides and olefins. p‐Toluenesulfonic acid plays a significant role in the oxidative amidation reaction. The reaction proceeds at roomtemperature, resulting in (Z)‐enamides under ambient air
描述了一种方便的合成可磁回收钯纳米颗粒(Fe 3 O 4 -Pd)的方法。Fe 3 O 4 -Pd纳米颗粒的催化应用首次在酰胺和烯烃之间的氧化偶联中得到了探索。对甲苯磺酸在氧化酰胺化反应中起着重要作用。反应在室温下进行,在没有助催化剂和配体的情况下,在环境空气中生成(Z)酰胺。Fe 3 O 4的超顺磁性‐Pd有助于轻松,定量地从反应混合物中回收催化剂,并且可以重复使用多达三个连续周期,但催化活性会略有下降。
Stereoselective Synthesis of Enamides by Pd-Catalyzed Hydroamidation of Electron Deficient Terminal Alkynes
作者:Niranjan Panda、Raghavender Mothkuri
DOI:10.1021/jo301772f
日期:2012.10.19
Hydroamidation of electron-deficient terminal alkynes by amides in presence of Pd catalyst has been exploited for the stereoselective synthesis of Z-enamides. The possible intramolecular hydrogen bonding between the amido proton and carbonyl oxygen of ester group provides the extra stability to the Z-isomer of vinyl palladium complex, which subsequently undergoes protodepalladation and leads to the Z-enamide selectively. This process is found to be mild and operationally simple with broad substrate scope.