Overcoming Photochemical Limitations in Metallaphotoredox Catalysis: Red-Light-Driven C–N Cross-Coupling
作者:Samantha L. Goldschmid、Nicholas Eng Soon Tay、Candice L. Joe、Brendan C. Lainhart、Trevor C. Sherwood、Eric M. Simmons、Melda Sezen-Edmonds、Tomislav Rovis
DOI:10.1021/jacs.2c09745
日期:2022.12.14
wavelengths. Herein, we show that low-energy light can also enhance the desired reactivity in metallaphotoredox catalysis by suppressing unwanted hydrodehalogenation. We hypothesize that the reduced side product is formed by direct photolysis of the aryl–nickel bond by the high-energy light, leading to the generation of aryl radicals. Using deep-red or near-infrared light and an osmium photocatalyst
A novel catalytic method for the straightforward hydrogenation of carboxamides and esters to primary alcohols has been developed. Chiral modification in the ligand sphere of the well-defined Cp*Ru catalyst molecule opens up a new possibility for the development of an enantioselective hydrogenation of racemic substrates via dynamic kinetic resolution.
Ruthenium-Pincer-Catalyzed Hydrogenation of Lactams to Amino Alcohols
作者:Jiangbo Chen、Jiaquan Wang、Tao Tu
DOI:10.1002/asia.201800759
日期:2018.9.4
available ruthenium pincer complex (Ru‐MACHO‐BH) as a catalyst, the challenging direct hydrogenation of lactams and analogues has been successfully accomplished to deliver corresponding value‐added aminoalcohols in good‐to‐excellent yields under mild reaction conditions. Remarkably, in addition to N‐protected lactams, unprotected ones could also be readily reduced in the presence of a catalytic amount