Switching from Biaryl Formation to Amidation with Convoluted Polymeric Nickel Catalysis
作者:Abhijit Sen、Raghu N. Dhital、Takuma Sato、Aya Ohno、Yoichi M. A. Yamada
DOI:10.1021/acscatal.0c03888
日期:2020.12
and we confirmed that it is consistent with Ni K-edge EXAFS. The Suzuki–Miyaura-type coupling of aryl halides and arylboronic esters proceeded using P4VP-NiCl2 (0.1 mol % Ni) to give the corresponding biaryl compounds in up to 94% yield. Surprisingly, when the same reaction of aryl halides and arylboronic acid/ester was carried out in the presence of amides, the amidation proceeded predominantly to
通过聚(4-乙烯基吡啶)(P4VP)和氯化镍的分子卷积制备了稳定,可重复使用且不溶的聚(4-乙烯基吡啶)镍催化剂(P4VP-NiCl 2)。我们基于元素分析和Ni K-edge XANES提出了前催化剂中Ni中心的配位结构,并证实它与Ni K-edge EXAFS一致。使用P4VP-NiCl 2进行芳基卤化物和芳基硼酸酯的Suzuki-Miyaura型偶联(0.1mol%Ni)得到相应的联芳基化合物,产率高达94%。出人意料的是,当在酰胺存在下进行芳基卤化物和芳基硼酸/酯的相同反应时,酰胺化主要进行,从而以高达99%的产率得到相应的芳基酰胺。相反,在不存在芳基硼酸/酯的情况下,芳基卤化物和酰胺的反应没有进行。P4VP-NiCl 2成功地催化了内酰胺化反应,制备了菲啶酮。P4VP-NiCl 2被重复使用了五次,而催化活性没有明显损失。使用P4VP-NiCl 2有效合成药物,天然产物和