efficient organocatalytic system for the selective N‐methylation and N‐formylation of amines with carbondioxide (CO2) as a sustainable C1 feedstock and polymethylhydrosiloxane (PMHS) as a cost‐effectvie reducing reagent. High‐yielding N‐methylation products are obtained with low catalyst loading (1%) of DBU. Selective N‐formylation of amines is achieved using the same catalytic system at a lower reaction
Metal-Free Catalyst for the Chemoselective Methylation of Amines Using Carbon Dioxide as a Carbon Source
作者:Shoubhik Das、Felix D. Bobbink、Gabor Laurenczy、Paul J. Dyson
DOI:10.1002/anie.201407689
日期:2014.11.17
N‐methylation of amines is an important step in the synthesis of many pharmaceuticals and has been widely applied in the preparation of other key intermediates and chemicals. Therefore, the development of efficient methylation methods has attracted considerable attention. In this respect, carbondioxide is an attractive C1 building block because it is an abundant, renewable, and nontoxic carbon source
We herein describe an efficient iron‐catalyzed selectiveN‐methylation and N‐formylation of amines with CO2 and silane using mono‐phosphine as ligand. With commercially available [CpFe(CO)2]2 as catalyst, Fe‐catalyzed methylation of amines was achieved with triphenylphosphine as a ligand. Using tributylphosphine as a ligand, Fe‐catalyzed formylation of amines was realized at a lower temperature. The
β‐C−H Allylation of Trialkylamines with Allenes Promoted by Synergistic Borane/Palladium Catalysis
作者:Ming Zhang、Zi‐Lu Tang、Heng Luo、Xiao‐Chen Wang
DOI:10.1002/anie.202317610
日期:2024.1.25
The β-C−H allylation reactions of trialkylamines with allenes were accomplished by a synergistic borane/palladium catalysis. The borane and palladium catalysts promoted the formation of an enamine intermediate from a trialkylamine and a palladium-π-allyl intermediate from an allene, respectively.