Gold nanoparticles assisted formation of cobalt species for intermolecular hydroaminomethylation and intramolecular cyclocarbonylation of olefins
作者:Xiaohao Liu、Akiyuki Hamasaki、Yoshihiro Yamane、Shohei Aikawa、Tamao Ishida、Masatake Haruta、Makoto Tokunaga
DOI:10.1039/c3cy00336a
日期:——
The intermolecular hydroaminomethylation and the intramolecular cyclocarbonylation efficiently proceeded on cobalt oxide supported gold nanoparticles. The intermolecular reaction employing terminal olefins and N-isopropylaniline afforded hydroaminomethylated products as a mixture of regioisomers via a common reaction path consisting of hydroformylation, imine formation, and hydrogenation. In contrast, indolinone derivatives were exclusively obtained in the case of 2-alkenylanilines based on the intramolecular cyclocarbonylation mechanism. Both of these reactions were catalyzed by cobalt species derived from cobalt oxide. The active cobalt species were formed via reduction of the oxide support promoted by deposited gold nanoparticles. Characterization of the catalysts before and after the reaction was also performed.
负载于氧化钴上的金纳米颗粒促进的分子间氨基甲基化反应和分子内环加羰反应均有效进行。通过包含羰基化、亚胺形成和氢化的共同反应途径,使用末端烯烃和N-异丙基苯胺进行的分子间反应得到了区域异构体的氨基甲基化产物混合物。相比之下,基于分子内环加羰机理,2-烯基苯胺 exclusively 得到了吲哚酮衍生物。这两种反应均由来自氧化钴的钴物种催化。活性钴物种通过沉积的金纳米颗粒促进氧化钴载体的还原而形成。还对反应前后的催化剂进行了表征。