Herein, we report that merging palladium catalysis with hydrogen atom transfer (HAT) photocatalysis enabled direct arylations and alkenylations of aldehyde C–H bonds, facilitating visible light-catalyzed construction of a variety of ketones. Tetrabutylammonium decatungstate and anthraquinone were found to act as synergistic HAT photocatalysts. Density functional theory calculations suggested a Pd0–PdII–PdIII–PdI–Pd0
在本文中,我们报道了钯催化与氢原子转移(HAT)光催化的合并使醛C–H键的直接芳基化和烯基化成为可能,从而促进了可见光催化的各种酮的构建。发现四丁基癸酸铵和蒽醌可作为HAT的协同光催化剂。密度泛函理论计算表明,Pd 0 -Pd II -Pd III -Pd I -Pd 0途径,并揭示了在存在KHCO 3的情况下,Pd 0催化剂和光催化剂的再生同时发生。这种再生具有低能垒,促进了钯催化循环与光催化循环的有效耦合。本文报道的工作表明,HAT光催化在钯催化的交叉偶联和CH官能化反应中的进一步应用有望成功。
Conversion of Primary Alcohols and Butadiene to Branched Ketones via Merged Transfer Hydrogenative Carbonyl Addition–Redox Isomerization Catalyzed by Rhodium
作者:Brian J. Spinello、Jessica Wu、Yoon Cho、Michael J. Krische
DOI:10.1021/jacs.1c07230
日期:2021.9.1
The first examples of rhodium-catalyzed carbonyl addition via hydrogen autotransfer are described, as illustrated in tandem butadiene-mediated carbonyl addition–redox isomerizations that directly convert primary alcohols to isobutyl ketones. Related reductive coupling–redox isomerizations of aldehyde reactants mediated by sodium formate also are reported. A double-labeling crossover experiment reveals