<i>N</i>,<i>N</i>-Dimethylformamide-stabilized palladium nanoclusters as a catalyst for Larock indole synthesis
作者:Kaito Onishi、Kei Oikawa、Hiroki Yano、Takeyuki Suzuki、Yasushi Obora
DOI:10.1039/c8ra01410h
日期:——
N-dimethylformamide-stabilized Pd nanoclusters (NCs) have high catalytic activity in the reaction of substituted 2-iodoanilines with alkynes to give 2,3-disubstituted indoles. This indole synthesis does not require phosphine ligands and proceeds with low Pd catalyst loadings. The Pd NCs were separated from the mixture after the reaction, and recycled at least three times. Transmission electron microscopy images showed
我们表明N , N - 二甲基甲酰胺稳定的 Pd 纳米簇 (NCs) 在取代的 2-碘苯胺与炔烃反应生成 2,3-二取代吲哚的反应中具有高催化活性。这种吲哚合成不需要膦配体,并以低 Pd 催化剂负载量进行。反应后将 Pd NCs 从混合物中分离出来,并至少循环 3 次。透射电子显微镜图像显示,反应前的 Pd 粒径为 1.5-2.5 nm。反应后的粒径为 2-3 nm。X射线光电子能谱表明,反应前Pd NCs的结合能为335.0 eV。